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One thing I have found with guiding at long focal lengths is that folks often guide too aggressively and end up chasing the seeing.
One I have trained the PE on my scope I often watch the target star in say PHD to see if it moves around randomly much - at 2.3 metre focal length - that is seeing. If I see random movements I up the maximum drift before PHD will issue a correction and up the time between images to 3-5 seconds, else I will be totally chasing the seeing and trying to guide out random atmospheric disturbance!
I wish MaximDL or PHD had routines to measure and account for both seeing and DEC backlash with a lot more smarts!
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