Incomplete cycling is a sign of limp-wristing (no offense), which is a very common technique error among novices. Have an experienced shooter fire it before sending it back.I am convinced that the slide is out of tolerance and from time to time it doesn't fully cycle causing a case to stovepipe right at the top of the ejection port.
I don't think the CZ problems are a break-in issue at all. I think either the gun has a mechanical issue or you are limp-wristing it.I am going shooting today and if I have any more jams I am returning it and getting a Sig,H&K, or Kimber 1911. Sorry CZ.
Kahrs are well-known for requiring a break-in. Most other modern guns are good to go out of the box: Glock, XD, Beretta, SIG, HK, Ruger, most Smiths.
If you don't want to deal with malfunctions or gunsmithing, pass on the Kimber. Their track record is VERY uneven the last few years.