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The trim tab is generally adjusted so that turning in each direction requires the same amount of force when you are at your normal cruising speed.

The trim unfortunately will always be different at lower or higher speeds than your normal cruise speed making it easier or harder to steer in one direction or the other. This seems to be the way it is.

So, set it up so it takes the same force in each direction to turn the wheel when you are at your normal cruise speed whatever that is.