You might want to check this out. I found it very instructive.
http://www.stark-labs.com/movies/NEAIC08_Guiding.html
Quote:
Originally Posted by Matty P
Hi all,
I was just wondering if I could improve the accuracy of my autoguiding by changing the advanced settings on PHD?
The settings are currently set on default and I find that I sometime get some guiding errors that show up in some of my images.
Are there any settings that I can/should change to improve the accuracy of guiding?
Thanks in advance. 
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