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I assume your CCD/Software provides a real time look at the guide star as you are guiding! If so you need to adjust those setting such that (assuming no external factors) the guiding performs as well as you want the PEC to perform.
Be careful (and this is where you want to median combine multiple sessions), that external factors such as wind, vibration, balance at various points and focus will impact the autoguiding and, as a consequence the quality of the PE.
Cheers
David
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