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John
The more balanced the axis are, the more likely they will attempt to correct both ways, this is not good if your mount has backlash. Slight out of balance will make corrections allways push or pull.
If Polar align is accurate, RA will still always drive during tracking/guiding but DEC will need far less correctng, and will also then tend to need correcting both ways. It only drives on guiding corrections, they can be iether way, hard to avoide.
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