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Rebuild Amp regulator or replace with Huma

My Dreamline tact-compact .22 fx after a few hours first shot is slower about 80 fps, there is also a lot of difference in fps between shots at low power HS at minimum and also although not as much when HS is at maximum. Sometimes the regulated pressure also moves up about 10 bars, but not always. Since I bought it 2 years ago, it has always been with the factory setting, 125 bar according to the Huma pressure gauge. I need to get back to the precision and consistency I had. What do you recommend to rebuild the regulator or buy Huma. Those who have a Huma regulator installed could tell me about their experience.