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My WAG would be magazines as well.
Point; BCM advises H3 Buffer with Supers. I run H3's in 4 different 300 BLK's, shoot nothing but handloaded 110 gr BlackTip at 2400 FPS with no issues.
I'm not familiar the JP heavy spring.
If it were me I would source some different mags (I run Brownell's aluminum in 300 BLK) and throw a conventional H3 buffer and Sprinco Blue or Green and test again.
I'll add I would try one component change at a time to narrow down the issue.
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