I'm shooting an Electric MR4 (.68cal) and just got the invert too but I keep chopping paint (on barrel). I have the motor speed at 3 and microphone at 6. It shoots about 3 or 4 shots then breaks a ball then I have to cock the gun again (I have a full tank and using good paintballs).... I have done the drop test on different motor speeds and it works fine but fails once placed on the marker. I didn't have any problems with the e-trigger and the gravity hopper except it couldn't keep up on full auto... any suggestions?