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That is a very nice image Frank; M83 is one of my favourite galaxies.
When auto guiding, it is generally recommended that you have the mount slightly imbalanced towards the East, so that it is “heavy” on that side, ensuring that the gears in the drive train are always meshed as they “push the weight uphill”.
If you are too well balanced, and especially when imaging near the zenith, then the mount can oscillate a little due to the slack or backlash in the gears.
Cheers
Dennis
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