Seems to be a lot of interest in light wind foiling.
Tested the Infinity 84cm (2066 sq cm) in ENE fluky 8-12 knots with occasional gusts to 18 knots to keep things interesting. Not normally exciting windsurfing conditions but I had a blast.
The big wing is so smooth and quiet - like driving a Bentley. Glides through long lulls and flight stays level and steady even when hit by 18 knot gusts. Foiling gybes are a snap as you can do them slowly. Touring around the river is easy, relaxing and heaps of fun

Reasonably fast - got 18 knots today without pushing it. I reckon it will do about 20 with a smaller sail and more wind.
It's easy to softly pump the wing with your feet (like a SUP foiler), which helps catch and stay on the tiny swells when down-winding with no wind in the sail. The lift generated by the feet-pumping prevents the weight of the big rig depressing the nose of the board.
Crazy fun - I can see why SUP foil down-winders get so stoked.
The COE of the 84 is about the same as the 76 in B fuselage position, changing to C would probably generate more lift as would using the bigger rear wing. I'm happy to stay with B and one size rear wing to make swapping wings quicker.
The Simmer Enduro 5 batten sail is ideal - light, powerful and has a nice springy action that helps pump on to the foil.
I don't think I'd use over 6.5m - I reckon bigger heavier sails would probably compromise the carving ability of the foil and I doubt would drop the foiling threshold much beneath 8 knots.
Stoked with the 8 - 28 knot wind-range of my Wizard 105, Slingshot 84, 76 and 68 wings, 6.5 - 3.7m Simmer sails