I realize it's been a while since you posted but have you ever sought out or looked at any tutorials Jasem has placed on the Internet. He covers How to find the suggested FOV settings and how to use/copy them to the necessary window for Astrometry to use it correctly saving time on the process. I found 3 separate videos covering Astrometry alignment using Ekos. If you follow the tutorials within you should not have an issue. I was having similar problems I just wasn't using a guide camera I used the main ccd.

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