try puting your "exeedingly cool pressure gauge" on each valve and then rotating the valve to "navigation" until your gauge drops to zero... that will tell you for certain that the valve is positioned correctly to prevent leakage out of the fill port. Failing that you may have to dissasemble the valve, inspect and repair to stop the leaks. Note that there is a nut and spring down inside the valves that could potentialy fall into the bladders if removed incorrectly. I have not actually had one of these valves apart, so I would proceed with the utmost caution after scouring the internet for some instructions....
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