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OK, for what this is worth since I'm not nearly as experienced as you and Greg. First, I agree with Greg that the max move of .2 seems way too small for such long exposures. Consider that the longer the exposure the more the mount could have drifted off, thus I have observed that longer exposures either need a larger max move or higher aggression (or both) compared to shorter exposures. So, when you decrease the exposure you are obviously correcting more often and the smaller max move is now able to keep up with the drift. With the longer exposure it seems to be taking a whole lot of smaller moves to bring the mount back to proper tracking so you get that wavy sort of guiding. Anyway, That's my first reaction. I hope you get it sorted!
Peter
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