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I believe calibration also determins the (arc sec moved / sec of correction) for each axis so thast the code can calculate the duration as well as the direction of the corrections to be applied. As you can set the guide speeds differently for each axis I think both axes need to be calibrated. Additionally if backlash correction is to be attempted then calibration in both directions are required.
Just how big is your DEC backlash? At 1x siderial how long does it take to reverse the direction a star is moving in DEC? PHD should be able to handle large DEC backlash provided you correct in one direction only (opposite any remaining drift), that works for me and my mount had 8-12 secs DEC backlash before adjustment.
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