it looks like you are taking too many shots. you need to figure out where you good shots are. usually between 1800 and 1200 psi.
Not sure of the shot count on mine. The Disco is used for shooting 6-7 pellets a day at an indoor target, then refilled. Although, the .25 Evanix Rainstorm II would be a nice addition, I can't justify the price. For that coinage, a .25 Marauder and another Disco could be purchased. Based on the Disco performance, a Marauder will be ordered when the funds are available. BTW, the smallish stock on the Disco is the only negative IMHO.