TechnicalBarbarity
Poser Disposer
You forgot about Steppenwolf, Vanilla Fudge, Blue Cheer etc 
I havent heard most of the bands you lsited, but from the ones i've heard i can safely say they're not as heavy as Black Sabbath, or even some of DP's heavier stuff. UH has some heavy ass tracks and gets close at times but is not as heavy as the bands i mentioned. Same goes for Dust. I'll have to check the rest of those bands out, which ones are less heavy on prog and experimentation?

I havent heard most of the bands you lsited, but from the ones i've heard i can safely say they're not as heavy as Black Sabbath, or even some of DP's heavier stuff. UH has some heavy ass tracks and gets close at times but is not as heavy as the bands i mentioned. Same goes for Dust. I'll have to check the rest of those bands out, which ones are less heavy on prog and experimentation?