2 things that may be simple, 1 check the output pressure of your HP reg, I had a stabilizer but it was an HP stab, it was ment for 600-800 psi, 350-400 was the minimum pressure it would put out, and i had similar issues to what you described,
second, try a different chrono. it might be off. but only worry about that if you think it might be shooting normally
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