Hi, Just recently picked up a used KWA MP7 and wondering about some upgrades and such. One thing I'm disappointed about it only shoots 350-370 w/.2's I noticed the white nylon/plastic flute/rocket valve. Would the aluminum KWA rocket valve help push the FPS higher? I also noticed a aluminum piston head for it as well made by "Action," would this be of any benefit? Any help would be awesome, thanks!