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AstroTortilla talks directly to Nebulosity 3. It is terrific, once (as Rick notes) you get it tuned.
The trick was to first estimate the scale (arcsec/pixel), then try some solves until I got a fit and then use the reported image dimensions to refine my scale estimate. After a few iterations, I had it nailed. Giving a small margin of error (e.g. if my estimated value was 1.66 arcsec/px, then I would use lower=1.63 and upper=1.69), I was able to get completely consistent fits in under 10 sec - blind. With pointing information from the mount, typical solves take 5-6 sec, and it almost never fails now.
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