Thanks, Arthur, that's just the sort of detailed explanation I needed.
I'm using the "historical" method (with 153c) because I use this outer loop of track (which has no turnouts) to run Lionel Prewar and Marx "fat wheel" locomotives and I thought it would be fun to use the method that was used in the past, back when some of these trains were produced.
My inner loop, which has four switches, I usually run in conventional mode, too, but I sometimes hook TMCC up to it for running my trains that are equipped with TMCC.
Just wanted to try something different, and historical, for my older trains, on that outer loop.