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Hi,
I don't have an EQ8 but with my EQ6 if I have problems guiding it usually caused by either poor polar alignment or not enough steps set in calibration of the PHD software.
Backlash should not be any concern to you if you have the mount slightly weights heavy and slightly camera heavy so the RA and DEC spur gears are leaning on the motor gears.
If you are using PHD and set it to calibrate ( PHD should do this automatically on first switch on) you should be able to see star movement in your monitor, if not increase the step size, I have mine set on 1750mSec.
Hope this helps.
Bill
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