Sounds like your regulator is zeroed out... meaning you turned it to the point no air will flow through it.
As for the second question, the tank output pressure won't have an effect on the LPR pressure. The air has to go through the HPR before the LPR. So the HPR regulates the tank output before it gets to the lpr.
So if i go back one way it should air back up?while i was at the chrono i had the reg go all the way in then back out.ill give it another shot and check inside the reg.