Looking to get a few weed fins for speed / slalom. Size equivalents in normal fins would be 34cm and 40cm. Can someone please point out how to correctly size a weed fin to match and recommend some good makes/models for outright speed and control. Have got raked speed fins that will do - more interested in bigger size options? Guessing the Mandurah Mob and Connewarre crew will have some good ideas? Thanks.