When you guys are driving downwind, what are you holding on to, the tiller extension, or the cross bar, or the tiller straight off the rudder head? I have not had any "squirly" steering issues downwind. Quick steering, yes, but not what I would call squirly, which to me implies it's doing things you are not telling it to.

I alway flip the tiller extension over the back and let it drag behind in big wind, steering with the crossbar or rudder tiller. I also hook my feet under the tramp hiking straps to keep from throwing myself off the back if I have to make a quick bear-away for a gust. I have my crew put their forward foot up against the back of the raised daggerboard to keep him in back and prevent the types of injuries described in that other thread.