Did you have you spin halyard tight? If so, ease off 6" or so. If you have a tack line, try easing that as well or instead. You may want to check your main and put on more downhaul and maybe even less mainsheet. If your boards were up and you were sailing high you may have been crabbing sideways.

I don't know about the melges, that is a big spin and in 4-6 it was helping them. Not unusually with the A Classers.