We finally found the one problem that George had hidden.  We found it after mentally preparing him, getting his feet fixed, and figuring out his personality.   We also found that George is the perfect example that horses forgive, because if he didn't forgive, he would have been a handful.   George is really bracey in the bit and feels that every time someone touches the reins, they are going to rip on his mouth.  If you ask him to back, he immediately begins gaping his mouth, chewing the bit and trying to avoid you.  He becomes nervous, but if you stay SOFT and persistent with him, he finally releases to the feel and finds the soft spot in the bridle.  We found that he likes to drop his head and stretch his back.  This is a good reward for him for getting over being bracey.