Anymore than a traditional roll on a e92 would result in a pulled distorted look, anymore camber would sink the rim in (ewww lol). I think your best move would be to run a 255.30 and increase the rear rates to 1000lbs at least. Sure its goona ride a lil rougher but its all part of the look/game. Had you wanted a medium of the aggressive smooth ride look the rim would be underneath the fender which is no longer aggressive to me.
btw....Alen E90 is the e90post angel, just sayin: