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I'd like to make another suggestion. Use CCDInspector to look at star field photos. There is a free trial of this software and it is easy to use. It will immediately tell you if your optical alignment is shifting (I think it must be given your results!) when you point to different areas of the sky. Be sure to use photos of a good star field that is well in focus. Perhaps you might also post a photograph of your imaging setup showing exactly how your camera and flattener attach to the scope.
Peter
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