After having a couple of boats with similar installs, I have wondered if a top plate would do the install some good. Inevitably our boats have developed small cracks in the gelcoat around the tower bracket. Some not so bad, & others not so good. A top plate made of billet, carbon fiber, or even fiberglass or plastic would spread the load across the top, just like it does on the bottom side. And it could be made to look good too.