JMO, but if he is seriously chemically imbalanced, why take him on and risk injury or his own self-destruction? He isn't going to "learn" when he is that sick. You see his "real self" when he is stable on medications, and you know he sometimes can't control himself. I don't know the answer, but I wouldn't engage a raging, out-of-control teenager in a battle for control because it could be dangerous. Perhaps you need another medication evaluation from a fresh perspection...a different doctor or a different type of doctor. Has he ever seen a neuropsychologist?
I hope you can find peace and not anger. Remember, as bad as it is for you, it is worse for him. He is probably terrified of himself! One last thing--I'm on Paxil and it's a Godsend to me. However, I know of MANY people who got seriously hyper, even psychotic on it and it's TERRIBLE TERRIBLE TERRIBLE to withdraw from. That could be adding to his behavior. If he is sometimes doing well, sometimes off-kilter then his moodswings around under control. He's on an awful lot of medications...good luck!