I have found with the EQ mounts it essentially does not matter if you do a good polar alignment, but the Alt-Az mounts I have had (Celestron CPC and the AZEQ6 in Alt-Az mode) it is just as important to level the tripod as to be careful about centering the alignment stars. Most times when I have had issues doing visual with goto inaccuracy, it was down to me being lazy about leveling the head first.
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