Terry,

Dunno if this snapshot captures an accurate glimpse of your trim because I realize you're changing it constantly. But FWIW, I would be running a lot less mast rotation to weather in those conditions (mast track aimed at the end of the rear beam) as well as full/tight outhaul (making foot almost flat) and cranked cunningham/downhaul. I may travel out just a tad and then sheet hard, making the sail extremely flat.

Since the helm problem seems to be on only one tack, you might check on your diamond and shroud tensions (symmetric).

I also has a similar problem once and found I had bent the rudder cross bar making it shorter and toeing in the rudders; the problem was on both tacks, though.

Sounds like a great event--thanks for the report