Now, if you are really stressed over this because this is a consistant prob and you want it fixed then invest in a 1/4" presser foot. That solved my problem years ago along w/the investment of the omni ruler that I can see thru really great. The foot keeps us w/in tha 1/4" and doesn't let us cheat outside of it:)LOL You are so close w/your measurements, and they seem to be consistant, I would be fine w/where you are on it:)Skeat