I think the cupping is related to these specific tires and the fact of rotating them around. Its maybe like the steel belts get turned one way from rotation and when you rotate the tires they have to turn and lay back down the other way and they bulge the tire surface up.
Not only me but several people had this issue with these tires - seen to the end user as being "noisy" when this happens. I think Tom ran lower pressure in the 40's if I recall correctly and he also had this issue happen. It might be some defect in the manufacturing of the tires I'm not sure. I don't see any problems with the suspension of the car to be honest (except for the rear end squatting down wearing the inside edge more).
Hopefully the new set I get down the road will not have this issue again. I'll wait until December or so to buy them after all my long distance trips are done, actually I got one to FL in December so when I get back before Christmas I'll buy a new set for Maxie. By then it will probably be 80-85K on the original set.
Edited by rbort, 12 June 2017 - 07:17 AM.