Hi Alex,
I use PHD with EQMOD and an EQ6. My imaging scope is a 127mm APO and my guide scope is an ED80 with a QHY5.
I rarely have problems with calibration however it has been a long road to reliability. Note that calibration can be difficult if pointed near the south pole.
First off, make sure the mount is correctly balanced in RA and DEC. I keep RA slightly heavy east, and DEC slightly heavy at the camera end.
I'll attach a screen grab of my PHD setup.
Cheers,
Rob
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