This was my point. Shorter cranks might facilitate a more aero position, but simply changing cranks length and keeping your old position won't change much.
But you should be changing your saddle height to allow for the different crank length. That's going to change your position in some way.
@hippy started
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This was my point. Shorter cranks might facilitate a more aero position, but simply changing cranks length and keeping your old position won't change much.