R3M Regulator Not Working Properly

Beautiful weather here over the weekend so I got to shoot the Edgun a bit. My gun is a Matador R3M .25 Standard and I have had it almost a year an a half. I am going to guess it has around 1000 shots through it as of right now, and the only problem that I have had with the gun was it had a leak due to a gouge on one of the regulator o-rings. The first thing I noticed this weekend was that my zero was off by around .7 mils windage and elevation high and left. I corrected the zero and then wanted to chrono the gun to make sure the FPS hadn’t changed from my average of 915fps it was at last year. I shot 50 shots from 220bar down to 110 bar when it dropped off the regulator and you can see the results below. I then filled up the gun again to 220 bar and shot 3 more shots which are the last three at the end of the graph in the 700’s. Any ideas on what to look for?