A couple thoughts.
1. If you have extensions then it could be a balancing act of valve core adjustment on both valve cores. I've had to do that a couple times in the past.
2. Get rid of the extensions and use one piece valve stems. Dually Valve Stems
are great for eliminating extensions that, from personal experience, have or will leak. This also eliminates the problems that can occur with 2 valve cores.
Item 2 is not meant to be tongue-in-cheek or ignore your immediate problem.
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