I am using a C11 and Starizona Microtouch focuser. I find I am balancing the step size with focus range. If step size is too big, get funky points on the graph. If step size is too small, often "just" miss the focus point.
For instance, the points on the right side of this graph represent really out-of-focus stars:
A bigger step size might have captured the curve better on the left, but the out-of-focus stars "look" like they are in better focus.
Also, I often get this, even when it is already pretty much centered on the focus point (ie. two ends of graph fall off quickly):
Appreciate any suggestions to improve the settings. I can supply AF packs if that would help.