I've had my 22 Avenger tuned to 1400 psi on the reg with 1.5 turns on the HS since I got it two years ago and it shoots the CPHP's and JSB 15.89 extremely accurately for. I've shot at least 20k of the CHP and 5k of the JSB's, I get 180 shots on a 300 bar fill. The issue I'm having is I recently bought a crown mk2 off the classifieds and the seller told me its good practice to keep the guns stored under pressure, which I never did before. Once I started doing that though my POI of would ship about a inch high and half inch left but when I fill it right before I shoot I have absolutely none of these issues. It shoots amazingly accurately for up to 18 magazines. I just cant seem to figure out why would prefilling my gun a day or two before cause much a deviance in my POI? Btw I tested this theory at least 3 times and one time I even over filled my avenger to about 4600 psi and even then it was a tack driver. If I filled it a day or two before then shot it, I would notice my first half of 80 shots would be high then eveny itld walk back to the original zero. Anyone know why this could be happening? If I was reg creep wouldn't it have been apparent when I overfilled the it to 4600 psi? It's jut really annoying and I want it to be as accurate from the first shot to the last. I would greatly appreciate any help or insight, much thanks.