[Seat Ninja]

You could try directly attaching the solenoid to the piston with a hard connection instead of tubing (idk how legal this is but it should be fine). The problem with the tubing is that its small diameter limits air flow and piston speed. Teams in 2008 (not sure which exactly) would lock a piston at 1/3 extension, then pressurize it (as if to extend it). They would then remove the lock and release it resulting in a very fast and powerful punch. I post this only because it took me forever to find out how they were doing it in 2008 and there were threads and pics of it all over the place.