Believe it or not, the cars that I build, that 1/2" makes a big difference between rubbing and not rubbing (this keeps sounding more and more dirty), but it's honestly true. Believe it or not 1/4" made the difference for me. The car was lowered aggressively, picked up the rears just about 1/4" and it got rid of the rubbing. I just depends on how BADLY you're having the issue. The worse the rubbing, the higher you have to pick it up, etc...
Idk I got 20x9 +35 2011 +55 f14 coming and I'll be trying to fit some 255/35 315/35 conti dws on them. Does anyone know if conti runs wider than say the nitto invo?