75cm fin question for R??mi

[Thomas]

Hi R??mi,
as I read in a post from you from mid-september you wrote that the actual Formula boards would all work better with a 75cm fin until 12 knots.
Which model/rake/stiffness would be the one For F161 and how big are the advantages over the R19 S-- +8 70cm?

Thank??s a lot and best regards,Thomas