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Adam, if you are using the refractor which I gather you are, you should not be getting coma. More than likely you have some sort of field rotation. If the stars are elongated in the same direction across the whole image I would say this is what you are getting. You have a flattener in the system and this should stop any peripheral elongation. I am getting something similar at present and have narrowed it down to my all up weight being a tad too much for my G11. My guiding is very good. Not sure if you mentioned your guiding, but make sure the clutches are not slipping as I have found this can cause "eggy" stars as well.
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