re: 180% headsail question
Years ago we had a '180'... it was a hanked on dacron (very light) genoa. I think we tried it once, and it never came out of the bag again - and the bag never made it back on the boat... not a real practical sail these days.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)