My rear tire with 6k miles on it is also cupping pretty bad. I have always kept my pressure at the recommended psi but starting at the end of last season I bumped my pressure up to 43 psi and I hope that will keep it from getting worse.
2011 Cross Roads Sunset Red
OEM short windshield, passenger backrest, crash bars, saddle bag bars, heated grips, vinyl closeouts, tachometer, ambient temp, LED headlight, luggage rack. WD lay down licence plate.