Mate I'm no expert and don't know if others on the forum have some scientific answer for you but all I can say is that I ride a smoke and prefer the way it flys using the "upwind" anchor point. The so called waves we get at home are only really foot to foot and a half slop but the way I ride I prefer the "upwind" setting.

Also, not trying to hijack your thread mate but on the smoke settings, has anyone tried the C attachment points?

Out of interest, what is the difference between the upwind and downwind settings?

hahaha, yeah i meant what changes on the bridle or whatever smart arse haha