Well the question is moot until we know what hardware/software you are currently running. A Meade LXD75 mount will have different PEC to a Meade LX90 and be different again to a Meade LX200GPS and be nothing like a GEM or Paramount. ie does you mount record and playback PEC or does it rely on a third party package?
My Meade LX200GPS has 120" PE that I could train and correct to 20" PE. I could probably get it lower with more training and effort but my auto/autoguiding doesn't care - I get more issues from small amounts of mirror movement than guiding....
Cheers
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