I can't say much about your points about width. I'm a skeptic about fitting formulas, but Spesh measured me at 143 and that has turned out to be best for the Toupe and old Alias series. But they're not my favorite saddles - that goes the the recent Selle AnAtomica H series (the Clydesdale version). So width is not everything, since the SA width is about 170 mm. But it works when set up right!