Tectonic talon fin for IS97

Hi all

I just found out about tectonic talon fin and apparently it receives rave review for it good upwind an all round performance. I plan to get this fin but not sure of the optimum size for my IS 97. My sail quiver is 7.2 m NP H2 and 5.5 m Naish sprint and i weigh about 54 kg. The place where i surf is at open sea and the wind usually blows about 8-20 kts with current about 2-3 kts. Appreciate your advice on this. Thanks in advance.