I agree that Saw Wheels+Tempest of Metal is more broken than a china shop with a bull in it. In my second game as a sawbutcher (first game I restarted due to a level 30 demon in the yeti caves) I got to the final dungeon. This was with an orc, not a whitehoof, and I didn't use CB. (Note that I have only one win on my regular campaign record.)
My one problem was a radiant horror, because I was dishing out so much fire and light damage along with my buzzsaws that my attacks kept healing it.

Personally, I didn't find the Sunwall too difficult so long as I kept my injectors ready and my Grinding Shield on. Sunwall mages deal a lot of damage but they go down like punks. Aeryn required tactical escapes and was a bit of a grind though (because I didn't use CB).