Cylinder help.

I just got finished putting my new air set-up on my 91 hatch. I got eai royal cylinders, gc valves, and 1/2" line and all the normal crap. My problem is that my front is hardly coming up. I'm running 145 psi and it is still barely coming up. I have an 8 gallon tank from suicide doors and its max is 150 but can I run any more? Secondly, why isn't the front lifting? I have looked at everything and the cylinders are fine and not hitting anything and I just can't figure out why it won't lift. If someone could please help, that would be great. Thanks in advance.