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I went from a guide scope to a pricey OAG recently....battled for a month or so to try and get it working after getting very similar results to your graph. I was thinking backlash, PHD settings, mount issues, alignment....tried everything....adjusted everything....pulled things to pieces and rebuilt......nothing helped.
Tuesday night I cracked it and swapped the ZWO guide scope back in, did a calibration and immediately did a 10 minute sub with almost perfect stars (it was very windy which wobbled the scope)
I don't know what the OAG issue was but I tell ya.....I wont be going back down that road again!
They say OAG is the way to go.......but with my setup a guidescope is much better....honestly think it depends on what you have and how things interact with one another
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