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I use a qhy10 with my GSO RC 10" and don't have any odd stars with that chip. The only flattener that I use now after testing about 6-7 of them is an astrophysics CCDT67 and that works beautifully. David Cortner has examples of the use of this fr down to f5 and his shots are great. I use it at 101mm spacing as suggested and have perfectly round stars when I need a bit larger field of view. I did a post on IIS about this somewhere and should be easy enough to find.
I wouldn't throw a fr into the equation until you have your collimation spot on as that will give you two variables and guarantee failure.
Allan
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