Been reading this thread from the beginning, but was too novice to add anything worthwhile.
Now, day 17. 160 lbs., sails 4.0 to 5.3 for wind from 7 to 21 mph. 4.0 for gusts of 21.
Very steady now, flies best on a reach at full speed. Maybe 16mph+. Hard upwind much higher than windsurfing normal gear, but height control depends on steady wind.
Foil 2" back from "recommended" setting using inside rear screw all the way back.
Mast base centered, front straps fully forward, rear strap one hole from front.
Stab at slight lift, to drive front wing down.
Sustained flight until breeze drops below 6 mph. Hard to balance when slogging thru lulls.
My normal ws board is 90-95 liters, 5.3 sail, in 12-21mph wind.
Foiling sail size 4.5 for 12-21mph.