I will like to install crown molding on my living room which has a vaulted ceiling. One end of the ceiling is 18 feet high while the other is 8 feet. I've already installed crown molding in my bathroom but the sloping ceiling in the living room is quite challenging. Because of the sloping ceiling the crown moldings do not match at the corners. That is, one side is higher than the other when they crown moldings are joined. Any ideas or suggestion?