There is one fight I found harder so far - the Gnoll Boss fight. This was for three reasons:
1) I went in the back way and the Gnolls immediately blew up all the Alchemists Fire that was lying around... half in the first round and half in the 2nd, and that set half my team on fire and destroyed the ladder. Afaik they deliberately targeted the bottles that are lying around everywhere. This is bad imo, and im sure an unintended consequence of tweaking AI while leaving all those bottles in the environment.
2) the Junior Zhent tried to charge our the cave and got merked immediately. This may have been the AI not coping with the loss of the ladder in round 1?
3) The Boss herself seemed to hit for more damage and harder - perhaps stats adjusted?
Overall not that much harder but it was more touch and go than I remember
