Good ground manners, but bad saddle manners. help?

I have a 7 year old paint. He has great great GREAT ground manners. Very respectful, playful, doesn't push bite kick and is good for farriers and vets. I have never had problems with him. But he has a lot of energy because i ffeed him extra food, hay, and weight builder. So if i leave for more then a few days he gets very very hyper and not safe to ride. But i free lunge until he has worked very very very very hard and then hose him off and let him graze after he has cooled off. But otherwise if i free lunge him on a normal day he runs to the far corner and stops. and wont move no matter what i do. And then he throws kicks occasionally so i lunge him on a line and he pulls and yanks but behaves much better. And so he gets a lot of energy out. But when i get in the saddle he walks nicely and trots quickly and eventually canters beautifully. Its after we're done with the work out that i get trouble from him. When i stop the canter and tell him to walk it out he goes in the middle and stops so i make him walk forward and he yanks and backs up so i circle him and continue on my way but then he runs me into fences and try to take off and ever reared a couple times. This is a completely new habit. I have had him since October. He wont even walk on the trail anymore. I need help. He needs to quit it. Ive been working with him and he has stopped some bad habits but he learns to avoid discipline. I need some help? im using a kimberwick bit.