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I got in contact with the developers of SGP about this issue when i first started setting it up. The problem you are having i think is because your step sizes are too small. Try setting it to 20 or 30 between steps. The software does not choose the focus point from the minimum HFR of a single point, it calculates the intercept of the straight lines made from each half of the V. It is not necessary to actually sample the correct focus point in your V curve. As soon as i increased the step size I got reliable focus every time.
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