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John what is guiding your Sphinx - a starbook (I don't know if this corrects tracking for polar mis-alignment) whereas the SkySensor2000-PC certainly does on a 3 star alignment if you put it into polar unaligned mode.
I suggest its doing more than just running DEC, its true King displacement - air's refractive index changes with elevation, its adjust both motors to compensate I believe - and it does it very well.
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