I have an impact mk2 power plenum with X liner that I bought new. Never had any problems and has taken a lot of game and put thousands of rounds thru it. Last fall I had to rebuild the regulator. It shoots minute of squirrel head out to 70 yards, but it really opens up beyond that. Reg is at 80, valve is open producing 900 fps with no creep. Shooting 25.3 redesigned. Do I need more reg pressure? It doesn’t sound like it is using too much air and I get around 70 shots per fill. Barrel is clean. Any ideas?