Rubbing issues? Just roll/pull your rear quarter panels. There are plenty of tutorials on youtube/google on how to do this. I doubt you are rubbing the inner metal wheel well in the rear, since I've only come across this problem because I've dropped my car too low (165/45s on a x7 apparently is not stretched enough to fit, so my next set up is 165/45 on a x8.5). I pulled the crap out of my quarter panels until I realized I was rubbing the inner fender well
lolololololol.
Oh also lower profile tires would definetely help. 55 side wall is big on any tires size really, I'd go wit something like 195/40 or 195/45. But for $120 you couldn't have found a better deal.