Í finished BG1 a few minutes ago. The fight i found most difficult was the one against the Cultists in Ulgoth's Beard. Backstabbing bastards kept hurting poor Edwin and the poison of their arrows can't even be cured by Marek's antidote. :/
Demonknight was a wuss, i had to reload twice so
i could get the XP for killing him instead of his clone (i wanted all XP available so also that of my clones). Sarevok and his buddies went down easily, i killed Sarevok in the usual way (summons, missiles). Aec'Letec is so easy once you've figured it out. I just stacked as many saving throw improving items on Kagain as possible and gave him a Potion of Invulnerability to drink. With a -7 saving throw against death (lol) Aec was doomed. Also, check out
this fairly hilarious screenshot.
Without the XP cap and with Grey Clan/Sirens Call/ton of other mods, and some scrollcheating (learn, erase, learn, erase) i got 500,000 XP per member. Kagain and Shar-Teel just made it to level 11 after killing the Iron Throne mercs. In fact, it was so easy i killed the Chess Board, Demonknight, Aec'Letec, all Werewolves (Balduran's Isle) and Sarevok without resting. I had all special ammo (aside from some +1 ammo used on Werewolves), all wands, all non-healing potions and a ton of scrolls (including all Priest scrolls you get) left.
Maybe i will try solo-ing, that might help. Heck, i didn't even do
all quests, i forgot about Tamoko for one thing and i played fairly evil as well.
Btw, has anyone noticed before the trip to Balduran's Isle doesn't take time? I got Kagain drunk before i took off and he was still drunk when we arrived must've been some ride...