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Mucel said..
It seems the smaller wing-big sails option needs less tuning.
Maybe, maybe not. Race wings generally come with shims for tuning, while freeride foils like the Slingshot Infinity do not. But then, race foils are used from 6 to 25+ knots, with the same sails, while the "big wing, small sail" option usually goes with multiple sails for different wind strength, and quite often with different size front wings. When the wind picks up to 17+ knots, I find a smaller wing (TC68, 1100 cm2) a lot more enjoyable than a bigger wing (i84, 2066 cm2).
For riding swell at our local spot, there's no way I could use the back foot strap (I usually don't use foot straps with freeride wings). The stance is a lot wider, with the back foot about 5 cm further back and much further inboard than when going upwind. The far back position is necessary to prevent the board from going down onto the water when going down a swell; just shifting weight to the back foot is not enough. But how a foil reacts when riding swell seems to be quite dependent on the foil size, what the swell looks like, which direction you are riding (straight down or at an angle), and how fast you are going. Smaller foils and more speed can make for a smoother ride. Others, with different foils and riding styles, have reported exactly the opposite of what I usually see - they have to move weight forward to push the nose down.
To add a bit more confusion, I'm starting to suspect that even the type of mast may make a difference. I have had a few sessions on a SB SuperCruiser recently, and some things are very different from Slingshot foils. The SB mast is a lot wider, so "spinouts" that are common with short Slingshot masts (71 cm or shorter) seem a lot rarer, if they happen at all. But when going almost parallel to chop in shallow water (1 - 1.5 m), there's more lateral instability, which
might come from the circular motion of the water affecting the mast. That sometimes makes me wish for foot straps on this particular foil (but I have not tried it yet to see if straps would really help). But I figure I need at least 10 sessions, and some playing with tuning options, to get the new foil dialed in.