He isn't so bad that on some days I just can't ride him...it is just really annoying on some sunny, breezy days. I don't think it's a bit issue...I have learned to be very light in my hands, and ride in different bits for eventing (a loose ring snaffle with or without flash for dressage, slow-twist eggbutt for showjumping and X-country, always with flash). I have only recently developed this system, however...before I would just ride with the loose ring, and his headshaking doesn't vary withthe bit/flash, just the weather. Would a UV protection fly mask possibly help? My trainer also reccomended a supplement called Taurine, said it helped one of hers who was really bad. Any advice on that?