I need a larger blast of air !

I just had a barrel modified to shoot arrows. Its not shooting fast enough to suit me though. The gun is a condor and I have an extra tank. So I would prefer to alter the valve if possible vs a heavier hammer wt. as the .22 barrel set up works perfectly and I dont want to change any thing there. I dont care if I only get 10 shots per tank and I dont care about noise I just want those arrows smokin! 😛 If any of you guys know of some one who could safely mod. my extra tank to deliver more air per shot I would really appreciate it.
Thanks,
Tag