Yes of course it is the PE thats the likely problem with my EQ8 mount. Unguided 3 minute plots clearly show the PEC drift with a distinctive pattern.

I would like to help with testing an Ekos routine to record and upload PEC. Dec guiding is acceptable it's just RA for me. Dec RMS is around 3 but Ra struggles to get down to 4 and can be higher. Drift plot looks broadly elliptical most of the time although strangely the tie up between plotted points and the resultant image isn't clear. What I mean is the drift plot can look poor but star image not bad or vice versa. I think the other factor not well presented in the drift plot is how long the star is out of position . Taking an extreme case for illustration, but imagine a drift plot for 2 positions 1 in the centre and one at 2 " radius. If the exposure was 10 seconds then star image would look worse if it was 5 seconds at each position and better if 9.9 seconds in the centre and 0.1 seconds at 2" position.
You can turn on Pec learning in Indi EQMOD tab now. I have used it and it goes yellow until it finishes after several minutes. Not much feedback but I could only assume it did it? You can turn on PPEC. Are you developing something different? I read discussions where if using PEC it can fight with guiding software which is also trying to correct it.

It would be nice to see a graph building with index position identified and drift shown on y axis.

You seem to be suggesting using GPG with PEC?

If I can be of help please let me know..

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