Agree with these two.. sounds like perhaps the genoa cars are too far forward for the sail and the leech might be choked off?
As always, though, these kinds of things are tough to diagnose with being there or at least some pictures!
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)