EDgun Low power matador R3M PCP

Hi, seeking help with my R3M,
My gun doesn't shoot as usual after deep cleaning, the issue is at the same hammer tension I got only 500 FPS instead of 880 FPS
I have tested everything (regulator, hummer spring, valve spring, the valve itself), and was working fine
My reg is set at 125 BARs
still can't back to 880, The max I can get is 670 FPS with a lot of hammer tension which eventually going to break the valve

any Idea

BR