Trying to figure out how to mark the waterline for my pocketship. Having some trouble. Marked down from keel 16 1/2 inches (down from the bottom of the keel) as the manual said for pocketship number 1. This was a start point. Then measured same distance down from the keel bottom right at the transom and went 11 1/4 inches each side from that. Can’t curve my Barton around the hard chine. Anysuggestions CLC crew?