I have a couple of CZs and what you are seeing, IMO, is pretty typical.
My guns function just fine, but they both have these imperfections.
You look at a Dan Wesson, and the workmanship is much better. You pay for that.
My CZ rifle however, seems to be built pretty good and is "pretty."
The handguns. . .not so much. The duty coat on their guns does not compare with Sig or Dan Wesson.