Thanks for the input, but I am asking about the shape of the keel, not the ballast. My ballast is a torpedo shaped, 16 ounce fishing weight, so that is fixed. I want to know about the area distribution on the flat "flying" surface of the keel. I agree that more vertical position of the boat is good, and that is what I am trying to achieve. It seems to me that more area higher and less below yields less rolling moment.

There have to be boat design books and studies out there, people have only been doing this for a thousand years or so, but where to find them? Anybody?