IT"S TOO HARD! MAKE IT EASIER!!!!
I kid.
However, I have found some of my most frustrating experiences can come from that dungeon to date. I recently had a failed purist tinker run. Mostly because 1/3 of the map was blocked off by high level monsters, and all of the kill accellerating(halpmeh, burndayraz, fine sword) abilities were behind them. It was ridiculously frustrating. Granted the one key thing I did wrong was I should have saved one of my transmute scrolls to solve that problem(that I didn't immediately realize I had). So I ended up losing to tower of goo, because I had to expend such a sheer amount of resources just to level up to GET to the other side of that wall that there wasn't enough left.
I am not sure something needs to be changed or not. The level was designed for tight corridors and monsters blocking them. However if I was going to suggest something to make myself feel better(and potentially people who literally know no better) maybe make monsters above level 7 like 10% less likely to sit in a choke point.