I agree, mine is a more severe case. On the positive side, though, he is able to trail ride with mares in the fall and winter. It's the spring and summer that give him problems when the mares get marish. That's why I have some hope (albeit small).
Also, after my horse reared, I got really stern with him after dismounting. I had definately gotten my horse's attention while ranting and raving at him. He had a look on his face like a child who had realized what he did was wrong. I calmly walked him out of the ring and into the round pen, and started to work him again with no problem. I ended on a positive note. Because of this incident, it lead me to believe that he isn't a rig because a rig would have gotten the job done (I'm guessing). I still wonder though.
I almost think that he needs me to be stern with him to keep his attention and obedience. Knowing this, the problem is, that's not my personality at all, and sometimes after work when I go to visit him, I just don't have it in me to do that.