I keep leaving this reply everywhere, forgive me.
Please try out the corney sounding videos called 123 Magic! I forgot who the guy is that is the speaker, because I borrowed the tapes from the school district. Tape one is for "start behavior" tape two is for "stop behavior" Once this win/win cooperation method is implemented at home, then it will carry over in his behavior when he is not at home. He obviously feels out of control and badly, about something, deep down. And it can be most likely remedied in a simple way. Please have faith and try it out.