Mark, I discovered, by accident, that a GFCI will also trip if the ground wire comes in contact with the neutral wire. Try it, jump a wire from ground and put in the neutral side. Perhaps you can explain why there is a small potential difference between ground and neutral.
I've made water sensing devices that trips a GFCI, turning the power off to a 110v water pump. The water sensor has a small switch that I've wired to short ground to neutral. It works, turns power off to well. It has saved me from having a flooded basement many times. Got 2 wells wired up that way.
I would recommend running the ground wire to the GFCI and see what happens. George
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