the only time I would err on skinny tire on wide wheel, is on paved road. However that has draw backs too. Like landing on your heel on a slippery surface.
As for MI sand I would presume that the new 700 Byways would be a good tire choice. not sure how the center slick would be for traction and what kind of hills you have. Ohio has short punchy hills, and I have never had an issue climbing them on snow on a 25c slick though. maybe it's the way I climb?