Slight threadjack - I'm 85 kg and have isonic 101. Have been trying an 8.4 race sail with it, to extend range. Don't want to bring extra board in the car.
I'm using 40cm fin, and it's doable but a little unbalanced.
Any tips as far mast track placement, boom height when using slightly too big sail? Over-downhauling sail seemed to help a bit in order not to drive the nose of the board down.