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Colin,

Take this with some caution, since I am not really familiar with ABW mode in Epson printers. I suspect, however, that you are actually using a profile (inside ABW mode) of sorts behind the scenes. The driver probably looks at the mode (RGB or grayscale) then uses its own profile or inking formula to lay down ink to match tones. Using the toning sliders will increase various inks for a sepia, cool, brown, or other tone. It's probably a bit like QTR under the hood, building around a neutral axis, and of course, assuming the use of the standard Epson inkset. Again, just a guess.

I find the "Monochrome Mode" in the Canon driver works best with grayscale images, and the color profiles work best with my custom ICC profiles (when printing monochrome images). I am guessing that with the Canon driver that they expect these modes are part of the normal workflow.

Lou