I completely think he's been traumatized! The fact he has such a major reaction to jumping and it takes you that long to get him back on track speaks HUGE of bad things that have happened to him!!!! If jumping is something that you want to do with him then take it S-L-O-W!!!! Have you tried him out of the ring? See if he has the same reaction to jumping something on a trail ride or in a field. I would try a very light hand before and after the fence ( try not touching his mouth over and on the other side) and stay off his back on the other side for at least a stride of two. If he jumps it then do something constructive when he lands. After staying off his back for a stride make him do a circle or a figure 8, do downward and upwards transitions. Give him immediate jobs to do that he is good at and you can praise him for. I would definetly try out of the ring first. KEEP US POSTED!!!!!!!!!!!!!!!!