I have installed my level 10 on my brand new minimag. 1.5 carrier, 2 shims, worked great for 40-60 shots. Then disaster! Massive leak down barrel. Went smaller carrier, less/more shims, changing the o-rings, the whole 9 yards. Nothing, still leaks. Then took out the regulator, pulled out the on/off valve, oiled, put back together. No leak. Fired 20-30 shots and guess what, disaster. Barrel leak, again. What am i doing wrong? When i press on the trigger slightly, the leak stops. Please Help!!!