You and me both, Blue! One of my horses is the same way. In fact, I don't 'trail ride' with him because it is beyond his ability and we worked on his issues for almost two years!
I use him for distance riding and we ride alone. This horse is the smartest horse I own and is such a blast. He doesn't want to run, he just wants to jog about 8 mph and he can do it for hours. He is a master of vet checks (we get all A's) and paces himself perfectly - I don't have to mess with him at all.
If I DO ride him in a group, I don't even let him get started with jigging - we just go straight to the front - which works out fine, because he will lead everyone else across water/slopes/etc without hesitation.
But once I decided that he just wasn't the group trail riding type, life was instantly better.
It is different when I ride with other distance riders who go the same pace, he never jigs when we slow down and we take turns leading and he is a different horse. But the lazy trail ride with friends? - I just take another horse.