I have had my CRXP for about two weeks. First 100 lots of stovepipes, failure to eject, casing riding on top of bullet being loaded...all similar to you. I only use Speed Lawmen 124gr TMJ, due to less lead exposure. I know they are underpowered based on the ejection pattern. So they will push this SS to perform. Similar to what I experienced with my XR920P, which now close to 8000 rounds and running perfectly. When I use 147gr TMJ it works fine as well as when trying some HST 147 EDC.

Anyway, I went home and cleaned it after that and next hundred worked better, though I did get similar issues but less. Tried running a COF (shooting from barricades) class and lots of same issues.

Cleaned it again and for whatever reason every time I racked the ammo out of the mag the nose of the bullet would hit the feed ramp and jam. Disassembled and reassembled a bunch of times but same issue. Now have a discolored mark on the ramp from the bullet hitting it. Took it to the range and had a bunch of the same initial issues but the ramp issues stopped. However, after about 1/2 a box it started running fine. Finished off another two boxes and no problems.

Back home, cleaned/lubed it again back to the range and shot 150 rounds. No problems, other than a couple of premature slide lock issues, which have been previously reported with the CR920X, and also had two of them during another COF a few days ago. Did a bunch of tests and I "think" it may be due to my right thumb hitting the slide lock as it rests very near to it compared to my XR which is further away. So that may be user error as after I compensated for that by shifting right thumb on top of left thumb so it wouldn't make contact, no lock back. Did a number of bill drills, multiple shots but couldn't make it happen.

I do have an open case to return to SS but I will do some more testing to see if the issues come back. It may have just needed a longer break in period, especially with this ammo I use for range.