My horse's left lead canter is very nice, very comfortable, and he feels fairly collected. His right lead is usually flat, and he tends to fall on the forehand and go too fast. It doesn't feel nearly as good as the left lead. But whenever I see him cantering on his own, he's always on his right lead. Why is this? What can I do to improve it, so it's slower and more collected like the left?
(He picks up both leads equally well.)