Everybody keeps talking about righting moment being an issue. That sloops go faster in stronger winds because the uni is on the wire too soon... It seems to me that if that is the issue, then the obvious answer is to lower the center of effort on the sail, for both configurations, which means a shorter mast, and possibly a smaller main.

The above is *not* meant as my entry into the fray. I don't know enough to add to the discussion in that way, but I do want to ask a question...

From the comments here, you would think that this is some kind of grand experiment, that there has never been a class that allowed both 1-up and 2-up sailing. Yet, AFAIK, there are several classes in Australia that do just that (the Taipan, and Cobra come to mind,) aren't there? How do they handle it?