M&P 22X cycling question

[Lumenator]

Hey all, I am wondering if anyone has a thought about this. I have a new 22X pistol, and it loves the CCI "semi-auto" 835fps ammo. This said, it doesn't like CCI Standard (1070fps) OR Minimags (1235fps). On both of the latter ammo, the slide locks back on every round, even though the mag still has plenty of ammo. You have to rack the slide every shot to chamber a round. If I go back to the 835fps ammo, it cycles fine. I have 3 magazines, and the result is identical with each. Also, the above results are the same with or without a SilencerCo Sparrow attached. Results are the same if the gun is clean or dirty. It seems to be all about the ammo, and I just can't figure it out. Guns typically cycle better with faster ammo, but this gun is the opposite. Any ideas?

Thanks!
Brent

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