Chris,
Have a look at this thread:
http://stargazerslounge.com/topic/11...uide-settings/
Chris Shillito is the creator of EQMOD. He recommends setting the guide rate at 0.5 - too high and the pulse duration is lower than what the PC can do (20ms) and you overcorrect. I've got mine at 0.2 and my guiding is working quite well.
Peter