It's working now, and honestly I have no idea why.
At first I tried loading an old save and it didn't change anything, then I tried starting a new game and it still just gave me the basic starting stats.
Then for the hell of it I tried loading a
really old save and got error-message spammed to hell which resulted in the game closing and when I opened it again and loaded my more recent save the stat changes had taken effect properly.
Starting a new game also properly gives me the increased stats now.
So uh...all good?
Edit : (Oh, and for the record I had tried to close and restart the game twice before the forced closed from the errors. I wasn't trying to add the file to an already open game session or anything).