iSonic 122 with 9.8 sail?

Hi all,

I'm considering purchasing a KA Formula 9.8 sail for the largest sail for early planning with iSonic 122 (2007). Does anyone have experience of using such big sails with iSonic 122? I guess a big fin (0ver 50 cm?) would also be required for that combo?
My weight is 76 kg.

I would appreciate any experiences using iSonic 122 + big sails.

Regards,

Sam