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Just keep in mind that a pure resistive load such as your heater elements have a power factor (pf) of 1.0. Your percent output meter is calibrated for a pf of 0.8 and so the meter will indicate lower than actual output when at load. Best to use your clamp-amp meter to determine loading.
With all the work you've done to this point, why take a chance on an iffy repair to a leaky well nut. Good to hear that you're waiting for the part.
I had to replace the well nut on my -803, PITA to get the fuel tank out to do it.