Joel B

I have 26.5 Scarpa F1s. I feel like I can get the top buckle tight enough but the boa bottoms out before my forefoot is locked in. I did the finger test with the bare shell and can get 2 fingers most of the way down behind my heel. Intuition web-site says to use 12 mm Tour Wrap but this site recommends 9 mm for F1. Pretty skinny calf and low arch. Suggestions?

PS I skied Denalis at 176.

Thanks for the feedback. What length would you suggest for 5'11" 145 lb 60+ male with strong technique but pushing any speed limits?