Hi Andrew,
I'm not familiar with a CGEM mount, but from looking at your graphs it appears that the mount is not responding to the guide commands in RA.
Are you certain it calibrates OK?, i.e. does PHD move the mount West approx 12 steps and then return to the East before it calibrates DEC. You have to adjust your calibration step size in millisec to get about 12 steps, my old EQ6 was set to 750mS.
Another thing, use guide exposures around 2 secs or more, any less and you are chasing the seeing and the mount will not respond quickly enough.
Good luck
Bill
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