We need to put door closers on internal doors for an HMO licence. The doors are old panelled doors with moulded facings. We bought surface mounted closers from screwfix the type that fits half way down the door frame with the rod that slides along the door to push it shut. We have fitted one but fully wound up it only takes the door to about 4 inches from closed. The actual door surface is 1 inch set back from the frame so the part of the closer on the frame and the part on the door are not level with each other. Is this what is causing it not to close properly. The instructions that came with them are very basic. I chose these as they dont look too bad on the doors but should I go for a different type of closer. Any suggestions gratefully recieved.