I'm no expert either but I've spent years pulling my hair out with this whole guiding thing. One night you get flawless guiding the next you get utter rubbish.
I agree with John though on the min motion thing. It sounds as though phd is over correcting if it is bobbing up and down. I'd dial the aggression down a bit and then adjust your min motion down a bit as well.
Can you post a picture of your graph?
Cheers
Sandy
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