I have avoided the ground-breaker feature on the d1/d2 boards.
to me, it adds more complications than it could solve.
OT but slightly related: I first learned the value of 'structured wiring' when I had some car audio installation work done many years ago. I asked the installer what his trick was in eliminating alternator whine and noise and he said to run a *separate* wire from the battery to each item. even if one item is a few inches away from the other, do NOT be tempted!
yes, you have a thick bundle of wires that *seems* overkill and redundant, but he was right and that was a good wiring design. local grounds (not long wires) but *separate* wires, non-shared. sharing can cause problems. sharing is evil
that lesson really sunk in with me. non-shared lines that run 'all the way' to the source. yeah, extra wire and extra clutter but its a good philosophy to follow. at least start there and if you can cut corners later and not have it get worse, that's fine; but I do like to start with 'structured wiring' and that means dedicated lines for power and gnd, for each thing.
and also remember: the power line up to the regulator is not nearly as important as the *short wire* that comes after the reg, to the load. think about your wall wiring: it snakes all around the house and its length does not matter (much); but once you go into the regulator, each inch can 'cost you' some current and regulation ability.
hope those tips can be helpful.