What tires are you looking to go with?
Although i'm not lowered, I was running 295/35/18 in the rear and 265/35/18 in the front on PS2. There was loads of room in the front, no rubbing ever, so I don't think you would have a problem with going 265/35/18. I think it will ultimately come down to the kind of sidewall on the tires you're going to run. 285/35/18 will be perfect in the rear, don't see that being a problem.