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Lee it is frustrating I know, I am still trying to sort out my Hotech Field Flattener with the ASi1600 on my refractor. Have the spacing exactly as suggested by the instruction sheet but it's out of focus, even allowed for the filter, and sensor coverglass in the path. I suspect the rear corrector element in my scope is buggering up the spacing norms.
Did you adjust the spacing to take into account the filter and coverglass in the path to the sensor? Applying the 1/3 rule? I reckoned that my 2mm filter and the 1mm coverglass (=3mm) required an extra 1mm of spacing. Most flatteners are ok within .5mm aren't they?
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