-- I agree with all of the "hunker down" advice
--Also, I agree with TXdoc not to go TOO light in the gears
--I also find myself tending to ride more "on the rivet" in the wind -- I sit much more forward on my seat. I have no theoretical reason to offer why this should help, but it seems to help for me.

Staying relaxed helps. Though you need to be more focused in the wind too, and that in itself is tiring...