I recall having a similar issue, I can not remember if it was Eta Carina, but it was in that bit of the sky. There was one area and one area only that just would not solve with PS2, in my case it would then failover to blind solving via the local atrometry.net backup and off it would go.
You can use ASTAP in SGP but you have to do a bit more than just select it to set it up. Google will be your friend there (I can't look up how I did it quickly, I am at work)
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