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I doubt this is your problem but I thought I'd mention it anyway. I have had it happen with the PMX when it was exactly balanced I would get an oscillation in the guiding. Like constant correct one way then the next then the original way.
Shifting the balance a tad stopped that.
Some suggest its better to have the balance slightly shifted so the mount has to pull the scope up when pointing east so the gears are fully engaged and no backlash causes things like I just mentioned.
My best guess is your worm is not up to spec. That would show up as high PE without PEC.
Greg.
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