WOW those fins look scary especially if you crash on it...
I'm also riding foils one of my friends makes them here in Hungary (Kitech, I would be surprised if anyone heard about the brand). We have some big lakes with super gusty winds and many 8-10 knts days when only foils are useable.
I have a 9m2 and a 15m2 foil and can ride about 9-30knts with a 144cm door and a normal 132cm board.
I tried a 19m2 (the biggest my mate makes) a few times but its just too slow for my taste but the hangtime is out of this planet
Its funny how the other kiters here look at these foils (many times I'm the only one with a foil on the beach), some of them won't even help to land it even if I say how to do it. I suppose it lacks the cool factor of a shiny tube kite and often I feel like a weirdo And when the wind drops to 10knts and I'm the only one cruising I can feel the hatred from the shore.
But every season there are a few kiters who dare to approach me, and asks about my kite which is obviously made by the devil. If someone manages to overcome the prejudgements and tries it, usually he ends up buying one and then a creepy laughter is heard on the beach: "Welcome to the dark side brother, from here its no return!"