I have zcp wheels with 10mm spacer in the back and I am rubbing when i go on really big dips.. The only reason is because I'm running wider tires (advan ad08). I never rubbed with the ps2's I had stock + 10mm spacers. I have pss's on reserve in stock sizes and they don't run as wide as the ad08's, it may be your camber?
Peanut Butter Chunky