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kobo said..
Thanks JB, yep that's what I find with my surf foil and 7m cabrinha drifter kite , but I haven't tried one of those single skin foil kites, which apparently drift way better than any lei kite, but they can't drift faster than the wind , So when your downwind foiling speed matches the wind speed, you have nothing to hold the wing up either ,so you have to bear away to keep some airflow over the wing.
Cheers Kobo
Not sure I 100% get your reply. But yes, when you're going the same speed as the wind going dead down wind (bearing away) will not work. Apparent wind is always changing depending on your hull speed and direction vs the wind speed and direction.
To keep a wing flying there needs to be some form of pressure. The Wing-Surfer weighs only 2.2kg and doesn't take much to make it float effortlessly. For example, in 15kn of wind (just short of 28km/h) in good swell it is easy to catch a swell and go 28km/h. That's were this happens.
These three pics are at 3 second apart during a swell run.
1. The wing is slightly in front as the actual wind is holding dominance. i.e. I am riding a few km/h slower than the wind. So the wind is still effectively coming from behind me.

2. This is 3 seconds later when I am about to catch a swell (you can see it building behind me) and am obviously traveling at the speed of the wind because the Wing has gone limp. Here you have the choices to either round up to increase the wind pressure from behind/across, or go faster to increase the apparent wind pressure from in front.

3. This is 3 seconds after again. You can see from the trim on the board I am engaging on a swell and accelerating down the face. My board speed has exceeded that of the wind and the wing is now flying behind me. The wind is coming from near directly behind me yet there is more air flow coming from in front of me due to my speed.

The problem you have with all kites is when they get into scenario 2. you have zero control. and they can not fly in scenario 3.
Hope this helps a little.
It takes a lot of time to get comfy and fully understand what is going on, but you will get it and be totally comfortable rotating the wing to suit.
Seriously a lot of fun.
Ride safe,
JB