Largest fin for Isonic 122 07'
What is the largest fin I can use with my Isonic 122 07'? I am 77kg and the biggest sail I use a 9sqm. The largest fin provided with the board (44cm) seems OK when the wind is constant and above 12 knots I am not very happy with its performance at marginal (9-12 knots) and/or gusty conditions. As the 122 is the largest board I have, I would like to purchase an additional larger fin in order to extend the lower limit of my boards rance, planning time and upwind ability. What size and type (maybe a R13 Race NR) would you recommend?