I got it working. I just think I made some mistakes with the names of stats/skills/etc.
Anyways, main problem I had were multiple mods.

Removed all in both Public and Mod folders, except for the Empty Mod folder from workshop.
I got that Empty Mod folder through subscribing on my own workshop item btw. That implies that workshop now has the right download location.
You will need to give them stuff according to their level. It seems to interact.
If you give them pyro skills, but they don't have pyro, you'll get a message they unlearned those skills.
Whats interesting is that they get vacant skill slots, they never learned the other starting skills.
