What should I take instead of the Psi skills by the way?
Multiple choices here :
- chemistry could be good if you want to craft higher tier nades and mines (but now that there are "plasma mines" and "plasma grenades" it's not necessary) and use higher tier acid ;
- biology could let you use more poisons and craft more drugs like bullhead (80) ;
- more tailoring for crafting armor and make use of infused leather : i would probably pick this one ;
- persuasion or more mercantile for passing some skill checks
- evasion for ranged and explosion defense (requires a lot of points to be effective though...)
You can check the wiki for crafting skill requirements
None of these are required so pick what you want.