I hear people talking about being "overpowered". I have been using my 5m wing in winds around 30 knots and I can't say I've ever felt overpowered.
There have been moments when I have thought that a smaller wing might have been more fun, but no moments when I have thought I have to get back to the beach before something bad happens or come in and change wings to complete a session.
When the wind is very strong I find getting to my feet a little interesting. The act of raising my front leg pushes my weight back a little and the board instantly comes up on the foil. It can be a little exciting foiling along on one knee. I can deal with that by placing my front foot further forward and immediately raising up on my back foot. That minimises the brief period where the foil is pitched up and allows me to properly control the board.
Similarly, if I allow the wing to get into an odd position and load too much weight on the handles the wing takes over and I can get pitched off backwards or lofted a little. I just don't do that and that problem is solved.
My usual technique is to allow the wing to self-align with the air flow. I suspect there is an amount of reflex in the profile so that the wings can sit stable when riding the wave. This would mean the wing will always seek to be stable in the air flow if you leave it alone. It seems to work.
I also suspect the large number of ex-windsurfers coming to wing foiling are bringing their previous expectations about sail size to the game. They're not aware of the self-stabilising possibilities of kite-style wings. They have talked about "holding down a big wing" when there is no holding down. I just provide support and it holds itself. Actually trying to hold down the wing creates the problem.
What do you think?