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In all honesty I can only think that your Polar alignment is out or you've got a dicky mount.
On the other hand how long have you set the PHD exposures.
Calibration now for me usually takes about 20-25 steps
I've only ever had a couple of problems using PHD and they have resulted from either picking the wrong type of star to guide on, leaving the mount unattended or my polar alignment was out
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