If the recoil spring is moving, most likely you're not ensuring that the metal end is fully seated. You can get it partially seated and that would likely cause malfunctions.

I've heard people claiming that the 2.0 9mm doesn't like lighter weight slugs. I doubt that, am suspicious of "limp wristing" in your case.

While I have only shot about 220 rds out of mine, all common grain weights, zero malfunctions.

Nothing wrong with MaxxTec, it's just Tula/Perfecta in a different container. I've shot a lot of Perfecta in 9mm and some in .380. Cleaner shooting than Remington. Don