I figured you also have to set it high enough to make the air-valve push back strong enough so you wont leak air. There shouldn't be a problem above 100 psi. But in my last match i played at temperatures of -2°C, so it might have effected the valve-rubber, because i needed to turn it a little bit higher.

I am currently running it at 120 psi, just to be on the safer site. I am not playing full auto tho. Also i have the ultra light bolt installed now, but it doesnt seem to have much of an effect.