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ASTAP is excellent, but also requires good focus.
That said, a couple of weeks ago I too had a similar experience with ASTAP in that one area of sky (Dragons of Ara) platesolved fine but when I switched over to the Helix, I could only platesolve 50% of the time and only if I binned my images 2x2.
It turned out that even though I had the right ASTAP database installed, ASTAP wasn't pointing to it.
Click the Epsilon button then the Alignment tab. Ensure the star database is H18. This one allows for higher magnitude stars.
Obviously you'll have to download and install H18 first. When you do, ASTAP doesn't automatically switch over to it, so you'll need to do that manually.
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