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TBB said..
Someone on the beach suggested thinking about pointing the rear foot slightly backwards to help with the edge control on a TT (along with the usual recommendations about looking, turning hips, weight predominantly on rear leg etc). I interpret this as keeping the toes pointing outwards in either direction of travel - i haven't had a chance to try on the water but i think i tend to point both sets of toes in the direction of travel.
Usually you set your bindings in a toe-out stance to help with comfort on your front foot. When you straighten out your front leg and lean back over your back leg, it's easier to point your front foot toward the direction of travel. You don't have to but it makes the stance easier to hold. Going both ways makes toe-out on both feet the most common setup.
That said, if you are pointing your back foot toward the direction of travel you may be shortchanging the torque applied when twisting your hips forward.
Here's an experiment. Stand up and hold a wide, toe-out stance like you would on a twin tip. Now try to rotate your hips left while leaving your feet in the same position (aim for 45 degrees but stop when it starts getting uncomfortable). What you should notice is that both feet want to rotate left as well, but the right foot is more uncomfortable due to the toe-out stance. You can check this by keeping your hips and left foot in the same position, but pivot on your right heel to point your toes over to the left. There should be an immediate drop in turning pressure on your right foot and most likely throughout your whole body. The problem is we WANT turning pressure (torque).
Consider a twintip running along flat on the water pointing in the direction of travel. If you rotate the board to the left, the fins will engage providing resistance to the original direction and make it easier for the board to now follow the new direction the board is pointing. When attempting to head upwind, you can engage the fins in this way by applying a rotation on the board to make it easier for the board to convert as much forward momentum into upwind direction. You can overdo it of course; rotating the board too far will give less edge to cut into the water, greater resistance to the change in direction and more skatey control. You're effectively putting the board into a power slide.
Due to board and fin configurations giving different effects the end result is more of a feel thing, but rotating up to 15 degrees from the direction of travel can still provide a more efficient upwind direction.