It's nice that you heard back from CZ USA so quickly! Since a couple other posters have a similar experience, maybe it's more common than we thought. My new PCR does not exhibit this no matter how slow I ride the slide forward. I would think if CZ thought it was serious enough issue, they would have offered to throw a free slide stop in the mail..
Perhaps this will smooth out on its own once the parts mate and are seated better through use. Could also just be a tolerance stacking issue. You could always order another slide stop for a spare and work on polishing the one you have and see if you get better results. That's probably what I'd do but then again, if it were my gun, I might just choose to "shoot through it" since the performance doesn't seem to be affected.