Using the traitor drone during boarding
The Traitor Drone carries 10 powerful limpet mines, which are replenished over time while it is docked at the Skunk. They can be launched towards the surface of objects, such as ships and stations, where they attach and await your remote detonation. Placing them in close proximity to groups of surface elements (e.g. weapons. shields, engines, jump drive) can wreak havoc on the target. Interestingly, they are stealth devices so you can plant multiple mines on a target without initiating aggression, then detonate them at your leisure. Combining stealth with timing allows for sabotaging a ship after it has begun to boost away from it's location (e.g. station, jump beacon or gate). As long as the detonation is triggered while the ship is still in the player's zone (maybe try riding it 
), you can cripple a target after it is out of range of any local defences (AKA the "XenonSparky Maneuver").
Other tips
Although possible to board some freighters with very few Marines, there is really no reason not to use the full 50. If you properly prepare targets for boarding you will never lose any and they are cheap enough to hire anyway. There is also the chance of them gaining experience: this will naturally be increased with more marines taking part in the op
Friendly NPC ships seem to completely ignore your boarding operation. They will keep firing at the target (if hostile to them) while your boarding pods are in transit which can potentially cause friendly fire losses. They Once aboard, however, your marines are invulnerable to outside fire despite their protestations (unless the ship is destroyed ofc; see below). 'Friendly' ships will also not hesitate to destroy the target in the middle of a boarding operation, which will result in the boarding operation failing and the loss of all Marines and the Marine Officer; for this reason it is advisable to only board L and XL ships while away from friendly NPC ships where you can conduct the boarding operation in peace. With a tougher XL ships ship it is perfectly fine OK to board while 1-2 NPC fighters are hammering it, as the hull regeneration can often be larger than their damage output. It is practically almost impossible to board a ship when an NPC L or XL fight FIGHT ship is attacking because their damage output will usually kill the target ship long before the operation completes from when boarding resistance (BR) is low enough to be safe.
Destroying the Drone Bay component does not destroy all contained drone units; for example after destroying the Drone Bay of a Cargo Freighter it still had 4 Construction Drones on it after boarding succeeded.<IME this is a visual bug. A soon as the ship takes significant damage all equipped cURVs will be launched to speed repairs; however they may not always appear outside the target ship. All unlaunched drones, eg cargolifters and any others will be lost - Snafu>
One can quickly get decent Captain and Defence Officers by flying into a built up sector and hiring the most expensive remotely. Both use 3 stats so the chance to get a reasonable one when hiring based on overall stats is pretty good; Engineers on the other hand only use 1 stat and that stat should be maxed: as such you may need to hunt with the small talk mini-game to find a good one.
Do not worry if you are left with nothing but a wreck with practically no hull after boarding. A 5 star Engineer will soon have it as good as new without any additional cost. You should always have one handy as your Albion Skunk Engineer anyway. If you plan to sell the ship you can reclaim the engineer for use in another boarding operation after it is done repairing to a sufficient amount.
Removing all ship components and reducing hull to 10% before boarding is a great way to secure a successful boarding. No turrets will mean no losses during the boarding pod phase and the low boarding resistance will mean no losses during the passive boarding phase. All the damage is only temporary and no problem for an Engineer to repair in the long run.
If you are struggling to reduce the hull and shields of tougher XL ships after stripping them of turrets then consider bringing your own to the party. If their Defense Officer is set to defend then they will only attack the ship if you order it and will immediately stop firing the second you tell them to stop. Such a ship can make a 5-10 minute weapon cycling nightmare against hull regeneration a 1 minute lazy job.
Some DLC weapons like the Heavy Laser (TTO) have the ability to damage components and hulls through shields. These come in very handy when destroying the primary shield generators of tougher XL ships since you can kill them without having to take down all of the massive shields. Do note that the Heavy Laser does not follow the auto aim mechanics: as such hitting components from a distance depends on the <player>'s ability to aim .(although this can also be a benefit!)
Unless playing with a self-imposed "no save-scumming" rule you will only ever need 1 Boarding OfficerMarine Officer, so it's well worth Smalltalking to find a good one: if a boarding operation fails or has bad results you can always reload from a previous save. It is recommended to make multiple saves at different stages of boarding to allow you multiple different points of retry in case something goes wrong. If performing this it is also recommended you find or make train a Marine Officer with maxed primary skills for the highest boarding strength.
The Albion Skunk with good strafe engines can effortlessly evade the fire from most turrets by constantly changing strafe direction. Dashing shields can help to quickly recover the odd hit that lands in between changing direction. This makes capping ships with only basic HIT/MA and Plasma/MA turrets a long but very easy task, no matter how many of them it has. Guided missiles are very useful for removing critical mobility components fast such as M/AM Drives and Jump Tunnel Device. You should can easily build up enough a good stock of them by killing fighters as well& looting their cargo.
Starting with 4.0 better captains of L and XL ships will often try to flee if in a losing situation. This can be used to the players advantage to push them away from allied NPC ships into quite quiet areas for capture. Once the ship is in a suitable capture location you can shoot up the M/AM the Drives to render the ship immobile and unable to flee. You can then strip it of weapons and board at your leisure.
Pay attention to the Jump Tunnel Device of L and XL ships you plan to board. If you see it starting to glow and making noise you do will not have much time to destroy it before the ship jumps and is likely lost for good. This can be difficult as it is always shielded. Missiles and your heaviest guns are most useful in this situation.
Although one can in theory board high end L and XL fight ships, the chance of you pulling it off is extremely low and often dependant on abusing exploits so as to not be destroyed*. This is especially the case for ships equipped with Plasma/JET beams as the Albion Skunk cannot survive more than 3 hits at close range and a single hit will break Dashing type shields and leave Behemoth shields in a critical state. Although JET turrets do have slow rotation rates, if they ever face you they will damage you no matter how well your strafe.*
You can still communicate with the crew of L and XL ships while in the middle of a boarding operation against them. They will respond with their usual hostile "go fly into a black hole" type message despite 50 marines coming after them. The instant ship control is transferred to you they always magically disappear. Although lore-wise one can assume they were all killed during the boarding operation it does not make much sense that everyone would fight to the last person. One cannot help but feel this was a missed opportunity for "prisoners" or an alternative to recruiting staff (some of them would be willing to work for you in exchange for a little money or even just sparing them).
Boarding resistance does not have to be zero for no losses to occur. It is perfectly fine to board a ship with 40 or more resistance and expect no losses as long as your Marine Officer and marines are sufficiently skilled.
*It is perfectly possible to cap L & XL FIGHT ships, but it is very time-consuming & likely to use a lot of (guided) missiles (even more time-consuming if you don't use missiles!) to take out target's wep clusters with their AoE splash damage. Better to focus on one that's already been heavily battered & was fleeing from a previous fight IMO. Ofc you should first focus on <target's> JD, then make the drone bay your priority; leave engines alone (since you should be close to the ship, functioning 'fleeing' <target> engines will take you away (using capship 'follow on' or slipstream' methods) from 'friendly' ships/stations trying to ruin your boarding op) - Snafu