I just talked to John at the CZ-USA warranty department. He said that the small RAMI was not meant to be a range gun, but a pocket/carry gun, and that I should use my larger P-01 or P-06 for my range gun. He said the RAMI recoil spring is good for about 600 rounds, then should be replaced. I had about 400 rounds, maybe more (I was not keeping an exact record), thru the RAMI. So, he said he would send me a new recoil (outer) spring and to try that first. If that did not end the failure to feed problems, then he would have me send the gun in for them to look at.
Also, I told him that the problem seems to be getting worse, as I shoot it more, which makes sense, given John's explanation.
As stated on my first post in this thread about my new 9mm RAMI BD: "the failures to feed all seem to have the nose of the bullet stuck against the lower portion of the feed ramp (almost horizontal rather than tipped-up much), with the slide not going forward. I always just pull the slide back quickly and release it, and the slide itself shoves the cartridge into the chamber." Also, this happened when there was "a lot of power residue on the barrel's feed ramp". John said that with the powder residue buildup, that it might possibly be just enough extra resistance to overcome the RAMI weakened recoil spring's ability to ram the slide forward.
So, if any of you are experiencing any similar failure to feed problems in a RAMI, replacing the RAMI recoil (outer) spring might be something you might want to try.
I will post more info after I receive the new recoil spring and try it out.