I don't have back lash set on my focusmax settings. And I think I did 40 sample points on the V curves when I did them. I set up around 20 V curves to get a good average. It seems to do an efficient job. I did note that until I did over 25 points the bottom of the V curve was as you described H.
Have you just checked all the grub screws etc for being tight. I found during summer it was fine but in the first winter I had several instances of what you are describing until I tightened things up in the winter months. Now there is no issue.
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