What is the best output psi for an xmag?

[SuiciDal Sn Y p ER]

Hey,

I remember when i first got my xmag that i was ripping away and firing like a mad man at my field. Now whenever i try to fire fast the lvl10 either does that weird "SHHH" noise or it doesn't reset.

I'm thinking that it has something to do with the gas. My mag is currently at 270ish fps and the output psi is around 1000ish (i set the tank at 800 but every time i refill it the thing skyrockets)

I'm just wondering if lowering the output psi and raising the velocity will do anything to help this problem

Thanks,
SnYpER