Looks like you have a WindFoilers paradise there Adrian.
Definitely one place on my bucket list

I think the potential for Windfoiling in Waves is huge and I hope we see some young pro's get onboard.
I think modern wave sails are fit for purpose, no change required there.
I think the future is medium aspect foils. Foils that allow you to breach a tip with no penalty. The Slingshot 926 is incredible for that, I can carve with 100 to 200mm of tip out no problem. Ideally for Wave Windfoiling I think a span of around 800mm is the go, 1000 to 1200 cm square.
900 seems a standard size fuse, I would love to see shorter options to loosen up pitch stability. Not sure but 850, 800 and 750 would seem like reasonable options. All bringing the stabiliser closer to the mast.
As for boards, mast base near the front straps, foot straps near the centre line and foil forward allowing a compact riding position.
Keep posting Adrian, love to see what other people are doing