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
AD08. Akra. Huper Optik. KW V3. Macht Schnell. RE SSK. TMS.