I am still struggling with the fact that if you set the traction bars up so they touch the springs all is good. If it was clutch chatter, how could setting up the bars affect that. I also go back to the fact that typically Mopar rear springs don't need traction bars just spring clamps. I hate to get fixated on something but this seems to indicate spring wind up. Too bad you don't have another set of springs, even lighter ones, just to see how it will react.