Hey Joe, thanks for your answer.
It seems like DF is gaining the experience from applying buffs and also using SCore Mechanics along the way to implement the loot progress. I was not able yet to copy the behaviour and did not understand it fully yet, but if you want to check it out the relevant buffs in DF are:
buffScavengingSkillLvl
buffScavengingDisassembleSkillXPTick
buffScavengingServerHack
Those are also tied to the MinEventActionModifySkillSDX (you can find that in SCore/Scripts/Mini Events). Maybe I also missed something else, cause even by copying the buffs and getting it to work roughly it does not work properly (it always adds a level to my perk despite the xp not being reached yet, quite strange).
Thanks for your tips with the containers, already tried that and its working like a charm.
I can also confirm that the loot actions dont work, figured that out as well.