Sounds like something is off in his SI.

Won’t switch leads behind, crow hops, won’t stretch out. Horses aren’t a**h***s simply to be a**h***s. Something is not right in the back end and he’s trying to tell you the only way he can. I’m betting it’s in his SI or his hip is injured.

I don’t care how great of a vet you think you have.  Vets are human. They can all make a mistake. Especially when it comes to horses.

I have a horse out of frenchman bogie.  Love love mine!  Anytime he didnt work he was off somewhere.  Now the streaking six they are a little different.  You should call and talk to Randy Jarvis he has rode a bunch! and knows how they think!  My friend has a streaking six and 2 well known trainers couldnt help her til she got with Randy and now they are doing really well! 

Good Luck! Randy is super nice and loves to see horses do good so he will help you anyway he can!