We said he will act out and he is. Your L is right, until he enjoys a free weekend in graybar motel he will keep trying to wear you down in order to prove he has control even in defeat. He got his D but not his Victory. He is determined to not be denied. Don't try to figure him out. Don't try to negotiate. Make your L aware, and therefore the courts. Ask your L what is involved in making XH pay your additional L fees incurred because XH chooses to violate terms and court orders.
This guy takes a pearing knife to a chain saw fight.