I ran into outer shoulder wear with the MPSS for track use.
Even with -3.1 deg of camber in the front and high pressures, the outer shoulder got killed with lots of tread left on the rest of the tire. Switched to SX2s, same camber settings, and the wear is much more even for track use. Sidewall is a little soft on the MPSS for hard track it seems.
http://www.ft86club.com/forums/showthread.php?p=2990277