So as I played through my good side of things, I came upon the normal Guts and minions. Though decicedly a tough fight, with 3 of my party falling into unconsciousness on and off throughout. Without the Zhent traders this fight went in my favor. I'll stick by my earlier posts and say for balance. The Zhents need to be out of the fight, you could possibly add one or two low level goblin archers without special effects such as fire arrows and the like. It may increase the difficulty to much, but it may not.
This playthrough I went through killing spike and those on the left side of the temple. Followed up with the Drow and her gobo bosses, then got oopsed into a fight with the gobo guards between main room, and throne room. Were Guts and her ilk came to try and slay me. Sadly for them I was up to the task. Ended with 3 companions need immediate attention, and the last needing healing. From there I goofed again and triggered the throne room fight. after this 3 of my party save Lae was kia. Though I did manage to beat it with no cheddar for my burger, the final health on Lae was 14.
Party consisted of Lae great weapon fighter, with longbow and her normal armor. Axe was the one that allows you to do 1d6 damage if your below 50% health. Shadowheart cleric normal weapons and gear save for the amulet she plucked from the corpse in the drow room. Wyll standard geared warlock. And my character another warlock Great Old one. (which really needs something to pick. atm they are to bareboned to stand up against Fiend warlocks and their dark ones blessing.) Spear from first ruins, that gives you true strike on misses. (unsure if it is working properly all misses grant truestrike.) and nothing other then normal gear.
A wizard/Gale instead of one of the warlocks might lower the difficulty, or a rogue like whats his name Ass, Astsomething might as well. May update in future.