I have a room that has sheetrock. I am putting planking over the sheetrock. I have crown molding to install. During the installation of the crowm molding (5 feet length). There is a 3/4inch gap between the molding and the ceiling. At the corners the molding is touching the the ceiling. Appears is the ceiling is not level. Question how to fill in the gap between the crown molding and the ceiling. Tried to bend the crown molding but does not work (crown molding 4" wide).