Recently my horse has been very strong and excited, even rearing at times, when jumping. We think iris because of the sprig grass as he is never usually like this. He has barely any grass (he is an extremely good doer) yet I still have barely any brakes in a Dutch gag on the 3rd ring. Is there anything I could do to solve this issue? Should I try a stronger bit or stick with the one I have and see if he gets better? Should I try a Waterford as he can lean on my hands?