I am sure you can practice the airjibe (vulcan) on the Futura 93. Yes, 5,8 m is perfect and just one single strap in the back is fine. Can remember, when I learnt the move in 2000 I used a Carve 99. Used just one strap in the back, but had only the option to fix it cross. Was fine. And used a shorter fin, around 24 cm.
You should check out a freestyle fin in 24cm with Tuttle Box system and check out some vids before you practice.
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