Hi Sam, I have tried a 9.5 Formula sail on the 122 and found it to be just a little
bit too big for the board. You can get the board planning no probs but its really
hard work to keep it going upwind. I even bought a 50cm fin and it didnt help.
I would agree with Martin and definately go with the Koncept, especially with
your weight you wont be dissapointed.