84 is super smooth and predictable (tad slow), with the 48 rear I can foil through the wind holes (at 90 kg)
I use this when 8-14 knots with a 7.8 down to onshore 5.0. I recently tested this against a friend who was on a much bigger
sail and weighs a lot less and I could pump up the foil quicker.
84 with the 42 rear, is a gybing dream as it turns a hair quicker than the 48 rear, I feel it goes off the wind much quicker as well.
I cracked some great duck foil gybes with this combo.
76 with the 42 is what I have been using in around 15+ knots. Almost nailed a 360 as you come in fast and it turns very nicely, this set up has this crazy ability to stay high up on the mast.
I can see why Azymuth loves the 76 for swells and down winders...for lighter weight guys or people wanting one foil set up, this is hard to beat.
Pic was on the 76/42 cranking into 360, that wing will grip you around FAST, so you better hold on :)