Sorry for the extremely late reply.....
Got it back from CZ. Polished feed ramp and chamber. Tested it out, no joy, didn't get through second mag without same problem. Stopped just short of going into battery by 1/4". Sent it back for a second time to CZ, same story polished ramp/chamber. Took it to the range, shot 200 rounds, many of which were fast as possible mag dumps into the berm. Zero failures. Took it back a second time, tested again with four different ammos and some mags with mixed four different types for a little more than 100 rounds. Again Zero failures. I am going to sell the gun soon, buddy might trade me a .22TCM from Rock Island for it, fun little gun, insane muzzle flash and zero recoil for a bullet traveling at 2,200 FPS.
Bad first experience owning a CZ, I am sure I will give them another chance, maybe a Shadow. Glad they fixed it so I can sell it without any reservation.