I am looking to add some pods to my boat. Looked at the pre fab ones from beaver tail, they are square chine and i have a round chine. i have a 18x56 with twin 23 long tails and looking for more flotation in the back. i know the transom is 17 degrees. What degree would i angle them up? I can figure the length and width unless someone has done this before. any ideas?

should be bout an 1 1/4 in up in back