RE: 6.2 vs 6.9 planning threshold
Have you thought about getting a 5.0 in place of the 4.7? I go from 4.2 to 5.0 and find the spacing truly optimum. Years ago I did the 4.2, 4.7, 5.2 and 5.7 thing, but todays sails are so much more rangy, making it realistic to minimize your quiver. Otherwise, you've got a pretty sound plan that mirrors my most used sails (4.2, 5.0, 5.75, 7.0 and 8.3). I have a brand new 6.3 that is 2 years old now that I have never really used, so I can readily understand your desire to jump from the 5.8 to a 6.9. However, Taty does have a point about using a 6.9 on a freewave type of board, but I'm unfamiliar with Tabou 3S line. The fact that the board is 107 liters does open the door a bit, as long as the sail is light and camberless.