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Jcaron, well thought out explanation and theory.

Not often do I see someone install something that does not need to operate at full capacity, and is able to deal with the lower output of the...

Handyman, I did accurate VD calcs, and min wire size will be #6 for the load and distance given by JCaron.

And, I would like to point out that whenever ungrounded wire is increased to reduce...

700 hundred feet?

Well, that is all the more reason to use GFI receptacles, and the wiring should be larger than #12.

A 500 watt load at 120 volts 700 feet needs a min of #6 copper and result...

And, I never use shared neutrals, other than the service entrance feeder, that I have no choice but to use a shared neutral.

Any branch circuit I install will have it's own neutral. An open shared...

OK, I hear and like your thinking on the AFCI, however, you can see that these can cause problems.

Most times it is good to exceed NEC requirements.

If the wiring is done properly, then any...

Why an Arc Fault breaker for a barn? Not needed. As you can see, any arcing will trip the AFCI CB.

The GFI breaker is doing it's job, assuming there are no wiring issues.

As I said, I would not...

GFI devices are as sensitive as they need to be, not over or under, unless they are defective.

Using a two pole breaker may not have been the best choice, as if, or better, when, there is a...