After the ftf, I proceeded to fire 125 rounds including 75 hollow points with no problems. This apparently random, intermittent ftf makes little sense. Could I be not holding the gun tight enough, especially with the 14 round mag?
How many rounds through the gun total? It actually sounds like you are doing pretty well for a low round count gun. As I understand it from your posts, you have run approximately 130 rounds through it since the repair and had a single ftf on the 4th round. I?d clean, lube, shoot more.
I get the frustration, I?ve had lots of other guns that just run right from round one. None have the performance of the RAMI.
I tend to break in a gun starting with only half full mags or 5 rounds per mag until a few hundred rounds are down range then start adding more rounds. Does two things, helps me focus on grip/hold and lets the feed lips and breech face smooth out nicely.
With any CZ, I shoot a box, deep clean, lube, repeat for the first 500-1,000 rounds, its amazing how dirty the oil gets. If it is still having an issue, then start thinking about working on it.
It looks like the Fed FMJ?s work well in it, maybe shoot a few hundred more of those then try the hp?s.