Sorry, lowering the door slightly is not an easy thing to do and really needs a very handyman or tradesman. The hinge recesses have to be extended and have the old space filled. It would be a relatively easy solution to get a nice piece of square wood the same thickness as the door and screw that to the top of the door, placing spacers (washers) between the door and wood to the thickness of the hooks. A nice coat of paint, and to improve the looks even further and protect the door, see if you can get a nice thin piece of stainless steel sheeting between the door and the wood.