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the calibration step you are using 3000 seems waaay too high
I have a 900 mm guidescope, and 1000 when guiding near the pole and 500 when far away seem to work well
The trick is to get around 20 to 30 calibration steps I find in NS and EW respectively. More than 60 steps, PHD will give up; less than 10 simply doesn't work !
usually dec backlash is cleared in around 6 steps or less..probably mount dependent
I think PHD will guide even if your polar alignment isn't all that flash; your resultant image may have filed rotation of course. But for guiding it doesn't have to be that perfect
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