Does your CGEM allow autoguiding? If so, are you using an autoguider? It seems to me that an autoguider would give you better results than just using PEC correction.
Notwithstanding this, I have a GM8 (non-Gemini) which I have not used very much in the past 10 years, and recently got a HEQ5Pro to play around with Goto etc, since the Gemini upgrade for the GM8 costs more than the HEQ5Pro.
Also I now have an autoguider so that I can start to do some proper imaging.
-John
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