I'm interested in this too! By the way grab the latest PHD (beta) and set the mode to resist switching.
Polar align as well as you can, and if you log your run if your corrections aren't random I'd guess either your alignment is off or your PE is high.
I used to shoot for 3.5 - 4.0 seconds corrections on my CG5. The higher quality and better set-up your mount - the longer your autoguiding between steps could be.
My guess is the least frequent adjustments at the minimal rate needed - the better.
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