I would actually watch the primary focuser knob if possible - and make sure the backlash compensation is at least 1/4 turn of the knob.
Also try to make sure that while the autofocus curve is taken and the focus count is going down numerically, the primary focus knob is turning counter clockwise.
For my EdgeHD11, the main “bowl” of the focus curve corresponds to about a 7-degree turn of the focus knob - so the backlash compensation needs to take at least 6 times the number of steps as the focus curve. So you may need a much larger amount of backlash than many people think.
And if the primary focus knob is turning clockwise instead of counter-clockwise, then the mirror may shift or slump a bit after each focus step - and the curve won’t be very well behaved.
This stuff is more complicated than it needs to be because the curve is always taken from large numbers to small - regardless of how “In” and “Out” are defined. But once you get it right, autofocusing an sct with the primary focus knob should work well.
Frank