Where/how are your valves mounted? If you isolate those from any metal, it might solve your problem.
BTW, sorry you're having problems, but troubleshooting is fun! (when it's not MY problem)
__________________
I'm a little
and a lot
Ground beef: A cow with no legs.
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'66 Chevy SWB "Penny"
'67 Chevy Big Window SWB- aka
"Pearl"
'72 Burb- "Betty"
"It's not a hearse dammit"
'99 Chevy Ext. cab Silverado