I now have 255/35 R18 tires fitting up front OK with the stock 8.5" rims. I did need to roll the front fender lip in, and grind away at a plastic tab. I don't have an exact measurement - but I would guess I'm at about -3.0 degrees camber. I was on the Shenandoah track at Summit Point which has a Karousel where pretty much anything will rub if it's going to rub. I did see some rub on the top of the fender liner, but raised the front of the car about 1/16". I think I'm rub free!
Roll tool:
Tab I needed to grind down some:
Running a square setup has some nice benefits! At this point I believe I could also run 245/35 R18s all around, but I don't think a 245/40 R18 would fit. A 245/40 is a larger diameter tire than a 255/35.
For reference I have the TC Kline double adjustable coil overs with Vorshlag camber plates.
-Joe