I can only seem to get 20 psi, but everything I've read says you should be around 35 psi, give or take. If I turn the needle valve counterclockwise to open it, the psi drops. Obviously this is my first go-around with co2 lol. What am I doing wrong? I'm using my diffuser as my bubble counter and I'm at 1-1.5 bubbles per second which is what I want. Just concerned that my psi isn't where I've read that it should be. Any help is GREATLY appreciated!