I have a 15hh ISH mare who is a very keen jumper and works lovely on the flat but I am finding it difficult to get her to work in an outline. I am riding her in a snaffle at the moment but when I jump she gets very strong and holds her head up and I feel that I am too harsh on her mouth at times but she is just so strong! But I ideally don't want to have to change my bit depending on if I'm doing flat work or jumping. I would like a bit that would encourage a lower head carriage yet provides good control and isn't too harsh on the horses mouth. Or should I try a bitless bridle?