Check into GFCI circuit breakers. They are more expensive, but they
will probably solve this problem.
Same problem - you can't share the neutral, so you can't run jacketed (BX)
12/3 around the shop to the various duplex outlets. The only *proper* way
to do this is with a double-pole GFCI breaker. I haven't yet found
these on the shelf (someone suggested checking out hot tub stores), but
they are rumored to cost upwards of $100.
I *really* like the idea of using 12/3 around the main shop, because it's
a lot less wiring hassle. But I may give it up in the end.
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