With the elimination of one set of traction tires and the replacement of the stock rollers with the BD-0000042 rollers, my 44-tonner clears every switch now. I do see the headlight flicker on the double-slip switches, but those are about to be replaced, so that's a moot point now.
I did lose traction eliminating one set of tires, but that's only an issue on the long grade to the second level, and this is a small switcher anyway.