16+ m/s and I am on a 3.0
And when wind foiling, that same 3.0 works already in really light winds.
For wind foiling I rig the Fringes just very slightly fuller than when wave riding. Pretty similar downhaul tension, never downloading too much, just a bit less outhaul when wind foiling. When rigging, I am looking for the same "connected" feeling that Levi describes here: