I have a Starboard Formula 167 wide (2012?) With a F4 CRAD 72-2 xs (7 degree?) fin and R3 10.7 & 9.6 sails. I've always had a lot of trouble controlling the board when the wind gets up above about 12 knots. Even if I slip the universal all the way forward I still have trouble with the board riding up on the fin (too much lift).
I'm guessing the fin I'm using in combination with the wide board is too much for my 78kg. Any suggestions of different formula fins that could help my problems (I'm guessing there are plenty around now that most people are moving into foiling)? I only use the formula in light to mid strength winds for up/downwind work.

Also, have anyone tried a lot shorter fins on formula boards with slalom sails for across light wind sailing? Does this work?

Thanks for your help