Repowered my 19 ft center consil Seaway (Eastern Hull Maine Built). Now I'm trying to figure out the right Prop. I have tried 2 so far. First was 13 1/2 X 17. WOT was 5200rpm max 28knts . Second Prop was 13 5/8 X14 with WOT was 6200 at 27knts. Would like to get 30Knts out of the boat. any Ideas. Thanks for looking.