Yes and even some super soaker sguirt guns have spring loaded fast actuation dump valves (trigger pulls certain amount and hair like triggerness happens) I actually have an old thread using one, pretty cool. Thanks for the help guise.
The band isnt the problem (btw i am using bicycle inner tube tubing). Its simple the moar pressure it has, the faster it goes. As for wicketthemodder619, the link is great, but I just dont have the time, money, or materials to pull off such a mod.