I have been re-reading the original S4, the original tournament module it was based on and the update Iggwilv's Legacy and something occurred to me. For a module centered around Iggwilv and her interest in demons, there are surprisingly few demons in this adventure.
Since I need to up the ante anyway I am thinking that I am going to replace some of the monsters with demons. It will be one of the last times I'll use demons in a 3.x adventure and I have tons of books on them. So stirges for example would be replaced by chasme (fly demons), the dao in the greater caverns (the "ante-chamber of the garden of 1001 delights") will be replaced by incubi and succubi.
I won't go overboard, but I think I have a few good places where I can do this and it will work out well.
I'll keep you posted.