This stuff is not rocket surgery. All as you are doing is attempting to keep the mast rotated such that there is a smooth transition from the mast to the sail, no kink or bend in or out. More down haul, flatter sail, less rotation. Go out on your boat and mark the position where the rotation and downhaul match by looking up the mast while sailing. This is your starting point and just adjust flatter by using both settings from there as the wind picks up. Typically for a full sail this is about 2/3 down haul distance and the rotator about 1/2 way between the db trunk and the rear cross bar. This varies for every mast and sail also with how much prebend you have in the mast, so the magic point is different for everyone and you need to find it for yourself. If your spreader rake is in the ball park, 1 item to note for the VMI Blades is that if you see the spreaders interfering with the jib going up wind, you can bet you are rotated out too far. This gives poor flow around the back side, cuases the top to kink and the leach to then flutter all while not allowing the top to twist off so is slow and feels over powered. By over rotating in board as noted by JC in a blow, the top of the mast spills of becuase these are very soft in sideways bending and bleeds off a lot of excess power while keeping the sail full down low. By controliing the sail power and keeping in control, you can get great hull speed and this is what then translates into the percieved pointing ability as the hulls and foils start working for you.

M