Answering the eternal question - where to set up the mast...
Fuselage position A has the least lift - C has the most lift (wing is more forward).We use B for the Infinity 76 wing.
C or B for the Time Code 68 wing.
C has a little more stability through the gybes, but probably more lift than you want when accelerating down a swell.C for the Infinity 84 wing.
I've tried A with the 76, but the wing sits too far back and it's hard to lift (for wind foiling). SUPs use this position.
https://www.seabreeze.com.au/forums/Windsurfing/Foiling/Slingshot-fuselange-position?page=1#lastpost
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C for the 76
Starboard Go (Friendship) deep Tuttle
They're mostly using Wizards (125s and some 105s) and the straps and mast box are further back. Should have added the caveat.
https://www.seabreeze.com.au/forums/Windsurfing/Foiling/Slingshot-Hover-Glide-Infinity-84-wing-review
Alan