The cluster resolves nicely Paul. Well done. You may wish to raise the black point in the blue and green channels to neutralise the background more, but this is a minor thing. Perhaps a little noise reduction if you're keen.
The Robofocus will improve your image quality if you believe soft focus is the cause. When you perform an autofocus run, make sure its on a star between 4-8 magnitude. Don't pick a bright one as this will cause fluctuations in the FWHM/HFD calculations. Make sure you get some good v-curve runs complete in FocusMax to get consistent focusing within the CFZ.
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