I am starting a 9’6’’ 2x1 board, that will have a double concave starting just behind center and running to the fins with a flat tail off the back. The board is going to be 23" wide and 3" thick. I am looking for some recommendations on depth and width of concave. I am also looking for recommendations on nose and tail rocker. I have never shaped a double concave bottom so any help would be greatly appreciated. Thanks