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I used to do all of my plate solving at 4.5' when I 3x3 binned and didn't have any problems. What does help is giving it a realistic number of stars so I tend to work with a magnitude range of 3-12. That gives plenty of stars in a catelog and is very generous as to what will be in the image.
Are you binning? If you are you need to change the image scale accordingly.
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