they can be a pain in the arse when you don't have the right set up from what i have seen. I have not hit a snag yet and its not even focused to the main ccd, I will post up what im guiding on so you can pee yourself laughing! but hey its representative of the stars and if it moves it corrects and the stars are round.
your setup is just a wee bit better than mine
so you shouldn't have a issue.