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Never considered changing the guide speed. That could be worth checking out.
For what its worth I find best results vary when it comes to guide exposures.
In poor seeing I get better results with fast corrections like 2 seconds. On a stable night 5 or 6 works well.
I got better guiding with a 300point t-point model and Protrack activated as well as PEC and autoguiding. Which is what I use now.
I think a Pempro PEC curve might even tweak it a tad more compared to Precision PEC or Sky X.
If you are getting oscillating guide errors my suggestion is to make your balance slightly off to the east to load the gears a tad so the backlash doesn't cause a bing bang effect. That worked on my PMX when I encounter that which I have the last 2 times I used it.
Greg.
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