Will your sidewalls get stiffer as the days go by? I seriuosly doubt it, it's just i put some general exclaim uhp on the rear of my car and when i do high speed moves it feels as if im badly rolling the tire. The rear seems as if its not quite in line with the front if you understand what im saying. Oh and the tires have 36 psi in them so its not that. Any info on this would be MUCH apriciated.