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I had a similar problem. I suspect it is the timing of your guide pulses during calibration - I pushed mine right out to about 750ms and it now works a treat.
I found that because my polar alignment was ordinary, I was getting a lot of dec drift and the fact that PHD was guiding in RA only meant that I was quickly in the red zone. Increasing the guide pulse sorted all this out.
Hope that helps
Pete
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