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if there is no problem with slewing, and only a problem with 'guiding' then can the root cause really lie with the mount mechanics? To me that situation would suggest a problem with communication between pc and mount, or with the guiding software (or both) - especially if this is indeed the *second* mount where this problem has been observed.
Perhaps the calibration step size in the PHD setup is set too low? Are you using a guide scope or an OAG? A loose USB cable or hub connection causing issues? The problems with PHD or EQMOD that I myself have observed with my own setup have usually been related to these causes.
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