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Some things to consider:
1. Balance of the OTA about the Dec axis.
2. Dec backlash compensation settings in PHD incorrect.
3. Alignment of Autoguider axis to RA/Dec axis not the best.
4. Agressiveness of Dec corrections needs to be right; too little is just as bad or worse than too much, especiallly if Dec backlash is not properly compensated for.
HTH,
Doug
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