Unfortunately, I've lost access to the computer that I made this file on, and as I said on a different post I'm probably going to play BG/SoA/ToB again once my own computer is fixed. I probably will play IWD again when I am done with BG1, though, so expect an update from a fresh, new C/R using FLAILS instead of hammers to be fighting then.
My unbuffed AC was about -4, and it got to about -12 with buffs. It would be better if I had access to some of those HoW items.
I didn't actually beat Y on my first try, though I came close. The sole difference in the two fights was that in the first I foolishly summoned undead instead of nature creatures. They worked well, but didn't hold as long as the bears and didn't kill anything. I took about 60 more damage due to this, and couldn't hold off at the door to inflict damage to Y. After a bit of scampering around, I took one to many arrows
About the traps: I just took the damage easily after resting, since I have original IWD with no hp capping.
I see you guys use lots of stealth. Should I have been using stealth as a C/R? I had just been using plate mail...