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airsail said..
I have various shims and rear stabs to change front foot pressure. I always like some as it helps make the foil stable. Just don't go too much as at speed even a small shim has a large effect and as sped increases so can the foot pressure.
Currently I have the slightly larger main wing fitted and a larger rear stab, I loose a bit of top eng but at least I can gybe and tack so quite an enjoyable day out. I find the bionic set up quite challenging, good in a straight line but I'm not good enough to keep dry in the corners.
Ditto - What airsail said.
The trim shim and the mast mount position have the greatest effect on a comfortable stance and they kind of adjust the same thing - but the key is you need to be in a comfortable position = less fatigue = more control.
I think I've got the levitaz 30 size shim in the rear, and I find that to be fairly neutral for me, or possibly a tiny bit more back leg pressure with speed increasing which I think for me I am more comforable with.
One thing I have noticed is that there is a great difference in riding stance when heeled and cranking upwind, vs standing up more and going downwind at speed. I find I can feel comfortable with just about any setting or mast position going upwind where a lull from the kite can be countered by pinching, than when standing more upright with the kite higher in which case a gust or lull results in pitch changes.
Looking at how the quickest guys on earth race downwind, the stance and board is upright, yet the kites are low, I don't think that is co-incidence - any time the kite is high on any foil you are at the mercy of the wind somewhat more that if it is low.
Have a look at the body positioning from these guys, who are some of the best of the best - and pause it as they round the top mark and proceed downwind, you can see the boards are relatively upright, the kites are driven low and bear away until the kite starts to loose some line tension, but the riders all adopt the poo man stance upwind, and the reverse kanga stance downwind to balance, and then the board is still not leaning over but pretty straight - the big point is the kite position with is allways low, even when the boards are not heavily leaning over.
You can see in the tumbnail below which looks like downwind kiteing, kite is low, Florien has what looks like a more neutral stance, the guy behind him has his back leg straighter meaning more front foot pressure.... so he probably has bigger rear shimms... or his mast is further forward than floriens or both shimw and mast forward.
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