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Gday Les
I will reply in case you are waiting for an answer. I am in no way an expert but i'll throw in my 2c. Probably time of day causes the lack of replies. mpcc = coma corrector (Most SW ED80s have a little coma near the edge of the image) but I have seen a lot worse than in your image.
Autoguiding - IMO the cheapest way would be a QHY5 autoguider (around $400 with postage) or the Orion which I suspect may be a little dearer but others may know better. I use PHD as guiding s/ware or alternatively guidemaster I hear is good both are free to down load. A few cables and a cheap achro guidescope and a way to mount it and you are away. It sure beats staring in an illuminated reticule.
Mark
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