First you've got to get hubby on the same page. Present a united front. Why had time out not worked? He's already given you a key to his discipline, you've learned that if you ignore his outbursts he'll stop. When he misbehaves, you put him in time out with and explanation and set the timer. If he gets up, you put him back without saying anything except "time out starts over." Don't argue with him, you're the parent, what you say goes. Tone of voice has a lot to do with it.

My nephew is a little %#@&#!. He's the youngest of six children so he was babied from day one. He doesn't misbehave in my house nor when I'm at his, Auntie loves you, but doesn't play that game. My sister in law asks "why does he listen to you?" Because I don't give him the choice not to. I praise good behavior and when I tell him to pick up his toys he does. Then he gets to pick the book he wants me to read to him. When he thinks the attention has gone to one of his brothers and sisters and he decides to wack one of them in the head, on the step.