My PP just got back from FX in which they performed a full tear down inspection and reseal due to it exhibiting significant velocity loss. When I first got the gun I tuned it to shoot 33.95gr at 930 fps and all the sudden it dropped to 740ish and nothing was changed on the tune. FX advised they couldn’t find anything really wrong with it just needed tuning. Upon return with FX tune, it was shooting the 33.95’s at 880…. So I turned up the reg to 130 and screwed in the power adjuster screw. Boom 964 fps so I backed out the hammer screw and dialed it in at 935 fps. After shooting 10 mags the poi is all over the place now. So I put it through the chrony, it’s all over the place on velocity 840, 888, 909, 921, 866 what in the Sam Hill is the deal?. Any feedback is much appreciated but I’m pulling my hair out. Thanks AGN