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Your calibration step sizes will be too long I think... the stellarvue finder you were using for guiding would have a shorter focal length than the ST80 I think, and therefore you would have had to increase your calibration step size... Try uninstalling PHD and re-installing in order to reset all settings to default and try from there...
Alternately, forget about using the on-camera guide port, and guide directly through EQMOD... To do this, drop down the "mount" menu in PHD and select ASCOM. You will also have to make sure "Pulse Guiding" is enabled in the EQMOD settings window...
I found pulse guiding to be more accurate, and much more customizable than regular guiding anyway.
Best of luck with this, and I hope you get it sorted out...
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