This is a "no holds barred" campaign. The ToH is the original character-killing dungeon; the expanded version is just as deadly. We've agreed that I'm playing this straight up. I am sorry that so many PCs have died, especially Shisaku's, but that's the way it's written, and this dungeon is meant to be the challenge of challenges.
This adventure is deadly, and some of the traps aren't even fair. But survive and win, and you can truly call yourselves gamers!