After making the turns, you have to allow for "settling." Since you are adjusting for the torque that's being applied, even if you jacked the front up and then let it down, you would need to drive around the block or something and then measure to get an accurate measurement.
Don't depend on just making X turns and then measuring. Get close to where you think it should be, drive around the block and then come back and measure to see if it works. Then before you get the alignment double-check it.
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