i know what your thinking "not another death wobble post" but get this, i went from 35" tires to 37" and bada bing! no more wobble... crazy i know, and i get a better smoother ride, only change is when its wet n windy i "go for a hell of a ride" haha
The fact that you had KM2s doesn't surprise me. I've heard a lot of people having vibration/wobble concerns with these tires (me included). Whether I stay with 35" tires or go to 37", I'm more than likely changing brands.