They won't be bothered too much about the tail swifing, as long as he has high action.
I went up the road one day to watch a very well-respected dressage rider/trainer take a lesson from an even more respected instructor who had been flown in. He astually had lots of corrections to make to her riding style, but no one cared that the horse's tale was wringing like a hand pump. The mare is a very successful upper level dressage horse. Nancy
