I am not sure if this topic is getting off topic or not

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Something that has to be addressed here is also personal preference. Take for instance the pic of Austin above. On that board (the 105L), I ride with my foil about half way and I am 90kg. Austin is more like 70kg and rides it all the way forward. Now I am not going to say Austin has it wrong, but he does

. No, seriously, Austin has come from a lifetime of foiling on GoFoil, a notorious front foot feeling foil, where as Naish is more neutral. So likely to feel natural for him, he rides it slammed all the way forward. From a technical stand point, it is actually not as efficient as being balanced up, but he can out ride all of us on here put together, so I am not going to call him and tell him

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You are likely never going to get every person out there even if they were riding the same board same foil to want their foil in the same spot. What I find neutral may be different to what Piros finds neutral. There is a technical way to set things up neutral, but then you need to tune to your liking.
Basic flight required an amount up lift to counter the mass/down forces. Every force that is applied that is not directly countering this mass directly is actually creating drag and the need for greater masses/forces to counter. This is why aligning the centre of gravity and the centre of lift is the most efficient way to fly, this will minimize drag and rear wing down forces required for stability. As your CoG moves from the CoL, extra forces are required to offset and correct to achieve an equilibrium. Again, the more forces added, the more drag is added, but more importantly the more velocity is required to produce the extra forces needed.
In theory, a perfectly balanced board with enough velocity producing the right amount of lift to counter the mass (weight plus gravity) would not require a rear wing for flight.
But again, some people like to feel of always having the forces out, even though it is very inefficient and draggy, it feels powerful! In foiling it is soo important to understand "Feels"! As we often think something is better going off feel. But I have tested soo much gear in countless settings, and I know that majority of the time, I am going the fastest when I do not feel like I am. Being unstable, or having to counter forces gives you the impression of power and speed, but in actual fact it is not.
Anyway, whilst I would like as many option as possible, I do not think it is the better option for production. The collective globally seem to agree with this as many boards made by international companies are sticking with the 10" tracks even after feedback from countries round the world. I agree, stick with the 10" commercially. But getting it "right" is important, assuming you speak to the "right" person to find out where "Right" is!
JB