Yes indeed debilitate changes were wrong since enemies have more HP now, you shouldn't be able to shred defenses fast.
Regarding the XP to level I haven't tried a new game (I don't have time sadly) but before it was:
self.xpNeeded = [0,100,200,300,400, 500,500,500,500,500, 500,500,500,500,500, 750,750,750,750,750, 1000,1000,1000,1000,1000, 1000,1000,1000,1000,1000, 1250,1250,1250,1250,1250, 1250,1250,1250,1250,1250, 1500,1500,1500,1500,1500, 2000,2000,2000,2000,2000,]
and now:
self.xpNeeded = [0,100,200,300,400, 500,500,500,500,500, 750,750,750,750,750, 1000,1000,1000,1000,1000, 1250,1250,1250,1250,1250, 1500,1500,1500,1500,1500, 1750,1750,1750,1750,1750, 2000,2000,2000,2000,2000, 2250,2250,2250,2250,2250, 2500,2500,2500,2500,2500,]
So until level 10 it's identical to how it was before, I suppose you already passed that level in new playthrough? I can revert the change back and maybe only increase the XP needed at higher level (since I don't want people to be level 50 at end of act2 already!).