Thx for your helpfull answer SparD
My Vader is new and it's a lot of fun to drive it above 14knts.
I prefer to feel the water and waves, foilkiting at the moment isn't in my focus
But I'm always jealous if there is 10knts and everyone is foiling;-)
I would use the 17 just to eliminate the time between 10-14knts;-)
And as I heard the 17m turns quickly, so it should works also in 1m Waves with 12knts with my weight and Board..
I hope so;-)