I’m with fietsbob on this one. I would stick with the rack you have and take off the lower adapter plate swing the rack down and or back and set it level about an inch or less above the fender and then make a new adapter plate to suit the distance from the lugs on the bike to the pair of holes on the rack. I know many people don’t have the skills or tools to do such a mode but a cardboard mock up could be made of what you would need and see if you can find someone to make it for you. Hardware stores sell flat aluminum bar stock that cuts easily with a hacksaw and can be bent pretty easy in a vice with a hammer and a wood block and hand drill the holes. I have done quite a few racks and they look and work so much better when as low as you can get them.