Carl your entering an area of possible frustration, as the RCs are not like newts that can be straight forward to collimate. As a RC08 owner that is still learning I can offer a few pointers:
Do not try to adjust the primary, this can get you into a cycle that leads to making it worse. The Cheshire can be used, but a good laser collimated (which has been collimated itself and verified on a bench test, is very useful. There are many online tutorials on collimating RC08s and you coukd also download and print the Astro-tech RC08 manual. Astro-tech and GSO are the same scope.
Good luck.
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