Alex - what size wheels you running? I assume 19" but what about the width. How about suspension?
I had HRE's on my old E90 M3 with the same size tires you are running (Michelin PS2). My rears were 10.5" wide with +28 offset. My motons were set a little too low at first and when I had 3 sets of golf clubs in the trunk and a passenger in the rear I would sometime get tire rubbing on the fender liner on the rear when I went over a big bump.