I also feel very unstable with head winds and crosswind on a descent. I get in my drops, hold the top tube with my knees as necessary, feather my brakes and slide my weight to my back wheel. Often my front wheel seems to start bouncing out of control. Braking sometimes seems to start this problem even without hard braking. I don't want to be going at an excessive speed when the wind is blowing me around though. I'll be watching this thread for any advice. Whippetgirl and I want to conquer the wind-at least a little.