Wow it really eats into you comments about the superiority of thinner airfoils
Thicker airfoils were your obsession when you had that tubekite designing job? Problem is tubes are not airfoils and making them thick does not have any aerodynamic benefits except in their deluded designers minds. Still to this day the highest performance kites are... the original kites, those ones with single skins and thin carbon spars, not even modern race kites can beat them.
As to the Soul those are all marketing terms, sure it is a good kite, looks to be quite refined and most likely the best currently, but if you were to hop from speed 5 to soul you wouldn't say it is twice as good.
Mods are always good if they improve something. Infact all good design or better invention is an iteration of improvements and that is what mods usually are. Just drawing a kite straight up is a recipe for failing. For the likes of a good brand like Flysurfer, most time would be spend testing and adjusting manually little things on a kite to get it just right and gain a fundamental better understanding and a better kite.
Yes the A15 can be improved, thinner airfoil would do a lot. Total redesign is not necessary, modifying (mod) existing features with improvements will suffice, A15 is already a good kite! I wouldn't want to ruin it by letting a hamfisted designer try copy it
Oh and eyeballing in person is fine, you have flown A15 right? lol.
Oh and good things do not come in 1 hour they are hard fought for and take much time. Good luck "expert".