I have a 2007 Rio M with a 8.5 rig and R13 Race 520NR (near vertical) "Drake" fin. I'm looking for as early planing as possible. Answering the "olzcyk" (has similar rig set up) threat you advised him to go to a fin in the 56-60 cm range for optimum early planing. My fin is 4cm shorter than the minimum suggested by you. Do you think that those 4cm are so critical that I still have to upgrade my fin to 56 or bigger in order to get my board to plane earlier? What length weed fin is going to be good for me 17" or 18.5", any brand recommendations based on USA market?
Thank you in advance for your answers and advice!