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I have a CGEM and a G11, and the G11 in stock form the reworked CGEM gets better PE than the G11.
I'd suggest getting your CGEM stripped down and cleaned up and adjusted. I have imaged with a C11 on a CGEM with no dramas. I don't think you will see any improvement with a GM8 and they need regular maintenance as well.
Have you had your CGEM apart or had it redone along the lines of the 'hypertuned' service? They perform radically better after a rebuild and you should have no trouble getting perfectly round stars, especially if autoguiding.
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