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Hi Greg,
I used a method of collimating my RC as described by the manufacturer, deep sky instruments.
It uses out of focus stars and described how to adjust both primary and secondary mirrors, based on the shape of the doughnuts and the asymetry of their brightness. When I checked the result in CCD inspector, it gave me an almost perfect score. CCD inspector gives very weird results on tight clusters or nebulae. Best results are on open clusters.
The methodology explains why a collimation scope may not be your friend either - mechanical vs optical alignment.
Happy to send it to you - if you send me an email, I'll forward it to you.
DT
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