It is an inline valve. I have shot it at 45 psi and it still has the same problem. I just dont know whats going on man!

No I have just left it stock.

Even if I leave the solonoid open the entire time it seem like the vavle hesitates and does not release quickly enough.

My Chamber is 1.5"x13" and I am using about 40psi through a 3/4" Rain Bird Valve out to a 3/4" barrell about 18" long.

I have recently attempted to use the typical Rain Bird Valve in my pneumatic cannon and use the solenoid to control flow. I can get the solenoid to open but I do not think it opens enough for the air to flow through fast enough. Has anyone had any similar problems or know what the heck is going on?!