I know of an amazing dressage trainer in Northwest Ohio that she actually specializes in Arabs like this I believe. She actually has an Arab now that she uses as a lesson horse that was very similar to your guy when she first got him. I will ask her if she is interested in taking him on or if you would like I could just PM her information. I was actually just up at her barn yesterday watching her teach a lesson to my friend who actually also has a problematic Arab as well as she has done wonders on the horse since she has had him (only 3 weeks). Let me know if you are interested.