Yeah, outline, shape, pressure points, leach, twist are different between different brands and some may need less tweaks than other. But, what does it need to make a fin slalom sail working better while used with a foil?
Off course the idea is not to have the best performer ever; just finding a better balance...

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Foil équipement:: Tribal - Loke

Downhaul the slalom sail 1 to 2 cm less when you go foiling with it.