My boat has very slight weather helm, almost neutral. I too drop the traveler down (when I remember). And, if my timing is right the boat tracks okay. Still, I haven't seen any of the Uni guys perform this operation nearly as quickly as a good sloop crew. I would say, on average, a Uni looses 5-10 boat lengths on this operation alone.

Getting back on board is a big problem for short fat people. But, even for others the boat can some times pick up headway immediately after righting and in such cases it is easy to get overpowered and end up being dragged along behind the boat. With the sloops, the best crews can board the boat as it rights, hold the tiller up into the wind and help the other member aboard.