In reply to rodw:
I wonder if Corrour Bothy would be a more logical overnight stop instead of the Hutchison Hut? Ran the 4000ers in mid May and the only unavoidable steep snow is the slope above Corrour at the col below the Devil's Point. Big bucket steps so we managed down ok in fell trainers in the soft snow but an ice axe might be an idea if you'll be on this slope early in the morning.
Iain