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Not wanting to put you on the spot Fred, but define reasonable? The truth of the matter is if your PE is greater than your arcsec/pixel combination, it is then deemed unreasonable. Clearly, guiding as you indicate mitigates this, however I think you'll agree that the fewer guiding corrections the better (indicating excellent tracking / low PE).
Anything that can improve your mounts performance is a good thing given it is the critical piece of the puzzle in the imaging game.
Also don't use PEMPro with an ASCOM hub. Just direct with the Gemini driver.
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