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azymuth said..I'm happy with the speed and carving power of small foil wings (windfoil) downwind

Your video really looks like you have a lot of fun. And you have a high skill level in windfoiling.
I really don't want to be unpolite or a offend you, but as i see it what you are doing is carving on the swell, doing turns you could also do on flat water. This reminds me of what a lot of wave kiters do when they "ride waves", they get pulled along by their kite like on a wakeboard rope. Sometimes there's a wave under them.
It doesn't look like your using/riding the energy of the wave a lot, more the energy of the wind.
While winging you could ride these swells by using the wave energy almost exclusively by flagging the wing.
I think that's the big difference of windfoiling and winging in wavy conditions, it's much easier to RIDE the waves with a wing.
I've been riding waves backside with my windfoiling gear too, that's really fun, but usually you outrun the waves, being too fast.
Trying to ride waves frontside down the line windfoiling is tricky stuff, controlling flight height on the wave face while the sail creates permanent balance impacts via the mastfoot. I had quite some nasty nosedives.
Wingwing makes this much easier.
But as i said, to each his own. It's just about having the most fun we can get.