I was curious about that. I knew you had upgraded everything, but I'm super jealous that you had brass right out of the gate. All the valves on mine are plastic, and not very confidence inspiring. I use compressed air though, so that particular valve never gets used, but the three behind the WH feel CHEAP. So I may replace them when I do some other upgrades. Just in case you wanted to know, I plan to use your setup as a model when I do mine; pretty much planning to do the exact same thing.
Back to the OP's issue: I look forward to reading your findings and how you end up resolving the issue.
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!