Sorry I wasn't more clear in my response. In Ekos, the GPG RA guider is the same as Predictive PEC in PHD2. And no, Ekos does not have anything like PHD2's Guiding Assistant, unfortunately.

Wow, that's one ugly looking graph. I would actually start by disabling guiding output, and just let it graph the tracking error with no guiding commands being sent, just to see what the mount is doing all on its own. That will tell you if those large spikes are a result of something mechanical in the mount, or the guider going crazy.

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