Don't forget pumping. The difference between slogging and planing in 10-12 knots for anyone your size with an 8.0 sail is pumping. There is a technique that includes arms, body and legs that will get you going if you practice. Pumping against a bigger fin helps quite a bit too.
I weigh 77 kg and can pump on plane with an 8.4 on my iSonic 111 in 10-12 knots. The wider tail helps a lot compared to the Futura, but the F133 should be plenty of board to plane in your wind.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.