My horse is starting to drive me nuts. He is an OTTSTB and is sound and everything. We will be trotting along and when I pull back on the reins to get him to slow up a little (especially downhill) he holds his head like a giraffe and does not slow down. Also, I think it is affecting his balance. I cannot turn him while trotting without him going off balance and walking. ATM I am using a mullen mouth pelham with double reins. Also ANY bit I put in his mouth, he chews on constantly. Even with the flash!!!!!! ARGHHH!!!!!! He is terribly impatient, too! I will stop him to talk to somebody and he paws the ground,doesnt stand still, and chews on his bit. What can I do to solve all these annoying problems?