I hear ya, but the pr was on phase 2 and I have not really done much sumo style before. I'm not sure why I haven't I think it suits my body better than regular deads ie: long limbs = better levarage for deads and as you might be able tell by my name I'm not long limbed =). But anyways yeah I agree about not going to heavy but I did 405x5 and I pulled it not easy but not gut busting effort eithier. So that combined with the "looks" I was getting and it was friday I figured what the fuck and put on another 30 lbs. Hit it once and was done.
As far as waist line goes, I've added a slight amount due to eating everything in sight.
I did both workouts yesterday too and I'm feeling it!