Two things I did stopped my amp reg from creeping: First I noticed that the plastic piston top had thin dimples from initial adjustments. I polished them out. Put it in a drill chuck, spinning fairly fast (and true with no wabble), then polish the plastic top being certain that you keep the top flat. I used a new razor blade, holding the sharp edge square with the top to scrape off material (rather than conventionally cutting material at an angle). It worked great. You barely have to touch the piston with the blade to have it remove material. Then, the second thing that helped, during reassembly I cleaned everything well and applied a thin layer of silicon grease on the washers, piston, and O-rings. This is so they don't take long to settle down after each shot. I think these amp regulator's have an issue with the washers and piston settling into place and that is why they creep up in poundage sometimes.