Can someone tell me why theres a belly in the bottom of some boards ? I would think it would cause drag to have that "Keel" down there . I had a board shaped for me I am very happy with it but it has this belly in it . 8ft. fun gun type shape for an older 48 bigger surfer 190lbs I'm also in fla. so I need a board for the crummier waves here . Got the hard rails I asked for and the double concave but if you put a straight edge on the bottom it has about a 1/2 in. belly in the middle of the back . Not the one created by the double concave but even sticking out further like a Keel or something .. Everything else about the board is perfect and I just think I need to have one more made and ask for it without the belly..