I installed a new Huma extra high pressure regulator on my Impact mkII and it seems to take a long time to refill the plenum after a shot. It also takes a long time to settle at it's final regulating pressure. Also, if you increase the bottle pressure, say from 210 bar to 230 bar, the regulator will creep up with it a little, to some higher pressure than it originally settled at. I have polished both sides of the delrin puck and the brass screw. The o-rings look ok. Has anyone experienced any of these things with a Huma? I have installed at least 3-4 AMP regulators with no issues.