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If possible, I'd suggest trying again and posting a screenshot.
pls also mention the steps you took.
I don't think PEC applies here because you're looking for drift in Dec, whereas PEC applies primarily to RA tracking errors, and while tracking, Dec isn't used unless you're guiding.
so creating a pec curve won't help with drift aligning, but it will help with guiding. But they usually have to complement each other, I'm not sure if using PEC with ST4 guiding is a good idea because the move commands could cause unpredictable behaviour, unless this is documented in the manual.
issue is this, the guiding software looks at movement and sends correction pulses via the st4 port when it see's drift. but if a PEC curve is loaded in the hand controller or in software, that correct could be over compensated.
so usually, when a curve is loaded via EQASCOM and pulse guiding is used, it knows what the combined result would be before sending the correction command. so they work well.
i'm not familiar with the hand controller PEC, but I'd suggest fixing one issue at a time.
so try using the guide camera in the main scope and using phd. disable guide outputs and turn on sidereal tracking and watch the dec drift in the phd graph.
Cheers
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