Sometimes when it's blowing hard enough to push one bow under, you might want to use the added lift of having the other bow in the water too, vs. putting the weight of the boat and yourself and the drive of the wind in the sails, all on the one single bow, as when trapping downwind. In light to medium wind I find it faster to fly a hull downwind, but when it really starts blowing I find I need the extra floataion of two bows or I end up diving to the bottom.

The whole thing is a constant trade off, risk vs. reward, so unless I really need to push it, I don't, because swimming is slow.