Hi I have just started to use predator 144a gas in my army Armament r26 and my Raven 1911 meu I only use the guns indoors for target shooting so wanted to lower the FPS but both guns don't seem to like the predator gas not being able to fire a complete magazine the slide not coming back enough to load a BB gas valve jamming open temporarily and a lot more gas being released from the gun when fired is this normal or should I switch back to we x2 gas