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Hi Craig,
I had a look at your flattener elongated stars image.
My first impression is its not bad at all. Its only subtle elongation. In a stacked image I doubt that would show through at the end.
But we all want nice round stars to the corners.
An 80mm scope with a camera with larger pixels could easily hide that small amount of elongation.
Do you have PEC enabled on your mount? How old is the PEC file? It may pay to do a fresh one as a new scope, heavier, may cause changes in the PE and PE can change over time as gears wear in more etc.
How old is the mount? What sort of RMS guide errors do you get?
Have you upgraded the mount? Some of these mounts have upgrade kits. Not sure about the 6R.
What settings are you using for your autoguiding? Exposure length, guide rate, aggressiveness, min/max move?
What software are you using for guiding? PHD2 is very good. Sky X is very good.
What was the seeing like?
Greg.
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