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I had a look at N.I.N.A. but it does appear at least presently to be missing two things vital to the SCT, first is the ability to reverse the focuser movement (And step count) and second is backlash compensation for the focuser, unless I just have not spotted those settings. The SCT needs a combination of both to focus cleanly and reliably.
The only software I have found so far that does both of those plus whole of image HFD averaging is SGP.
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