I wish talents weren't hard coded the way they are. I've tried changing the requirements by making my own Requirements.txt file- it didn't work. The effects can be worked around a little bit, but talents are going to have to remain the way that they are.
The aim of this mod is to make a playthrough harder while hopefully making the player consider different tactics compared to vanilla. This is the thinking behind my debuffs of the healing skills and the elemental resistances for the player.
By the game's very nature, a playthrough will always become easier over time as the player gets better gear, more skills, higher HP, etc etc. The boosts that enemies get late-game are limited to the fact that the fights had to be balanced around a player party of 4 characters, with all of the unknowns that entails.
I'll probably limit my changes to enemies with a simple mass buff to their base stats; ie +0 everything for Easy, +1 everything for Medium, and +2 everything for Hard. I don't know how I would be able to check if these buffs are actually applying ingame though.