Nacra 14sq the rotation becomes needed downwind in the light. Once the wind is up enough to force it around you are better off concentrating on not making mistakes and keeping your head out of the boat.
Up wind the in-haul is what sets the mast rotation so do not give it a thought as far as the spanner is concerned. Get the in-haul and main tension right and you are sweet. Again, less mistakes and mucking about inboard is faster.