Intermittent slow crank when coil wire is plugged in to the dist

If you are running so much Idle-advance as to affect the cranking, my guess is that the Transfer slots are gonna be nearly closed too, just so it will idle slow enough. That's also gonna lead to long crank times as the engine struggles to get fuel, and whatever it does get, if it ain't burning it, some to a bunch of it, is gonna wash the oil off your cylinder walls, and end up in the oilpan.
Do your engine a favor; dial the Idle timing back, get the transfers set right, then fix the Timing Curve.
That's my 2cents