[Ernst]

I don't think you can use a flow control to step up the pressure to a cylinder. I've only ever used flow control valves to slow cylinders down. What cylinder are you using? What's the stroke length, diameter, and psi rating? You can use a higher psi and/or a smaller cylinder diameter to extend more quickly. If you have a regulator in place between your air tanks and solenoids you could tweak it until it's allowing a higher psi to flow to your cylinder (just make sure it can stand the higher pressure; some might not be rated to the full 120 psi we're allowed).