[Mrpalmere]

It may be helpful to move the solenoid valve up close to the inlet port and have the air storage tank directly before the solenoid. Also, try using an open return port and use a rubberband to return the cylinder. Use a single solenoid or close off the ports on the double. Using a smaller diameter cylinder will increase the velocity of the actuation and using an open exhaust port allows for the freeflow of air on actuation. Hope this helps.