This is brownstone in New York, with main entrance leaf doors (one stationery other opens and close). On the operating door a closer is attached, also has a buzzer system. The past month or so the door stop closing completely. I have tryed increasing LCN tension on door up to 4 (door comes close but does not close). I have also had a carpenter check door he tighted hinges, shaved top portion of door where door sticks. It did not help. I can say there seem to be a slight gap towards top of door. Is there anything else that can be done?