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Which QHY guider? The 5Lii should be more than sensitive enough for an OAG. Don't worry if the stars in the OAG are not round, that is irrelevant for guiding.
Look, I virtually guarantee you that you'll get better guiding on a C9.25 with an OAG than you will with any guidescope. Post up a screenshot of your PHD session and let's have a look at what's wrong.
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