I donīt use my board for competition, Iīm begining in this formula class but I like to go fast. Some times I sail with others (formuleros) that have more experience.
The fin is R16 deboichei, rake +7 and soft less less 70 cms.
Generally the wind is about 14 - 18 knots and like I told you my weight is 66 K. I was thinking if is better cut the fin to 66 cms or use the fin that come with the board (R19).
Thanks for your help Remi.