What little I have learned about working on my 1983 scubapro and u.s.divers reg.s make a first stage presure guage for 100 to 300 pounds to hook on the inflator hose . at max tank pressure psi should be under 150psi leave guage on for half hour to see that it doesnt creep past 150 that would be reg freeflow when diving.. I took 2 shims out of 1st stage to get pressure down it worked.. if still creeped would have to r&r 1st stage seat I guess or R&R all parts I heard that under 150psi is good for many regs. but if 2nd stage still freelfowed would lower 1st stage pressure more any adjustment you find to lower 1st stage spring tension = lower 1st stage pressure might use a adusting screw on somr regs? that is my two cents worth also lube with cristolube that is for nitrox I use trident nontoxic silicon is very cheap as I dont do nitrox cristolube is so reg wount explode or you wont breathe fire I read on the web