to all the guys who track their IS, what square setup are you running?

Currently running stock tires sizes on a staggered 18x8.5 +35 / 18x9.5 +35 wheel setup and looking to switch to a square setup for obvious reasons. Trying to avoid getting a whole new set of 4 wheels, and want to just get a pair of 2 for the wheels i already have, but im pretty sure a 255 on a 9.5/+35 wheel in the front will rub the fender unless i run more aggressive camber in the front (which im trying to avoid for a car i also daily). trying to decide between throwing 255's on the 8.5 wheels, or running 235 or 245 on the 9.5 and seeing if it will fit.