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Hi John
Another possible cause could be poor collimation? If the OTA is badly out of collimation, planetary and lunar images that should show fine detail will tend to look soft and unsatisfying.
Do a star test on a mag 3 or 4 star, at a high magnification (say x250 or more), at least 60 deg altitude and have a look at the slightly defocused images, inside and outside focus and check if you have a nice set of concentric diffraction rings. This will require reasonably steady seeing; otherwise you’ll just see a confused blob.
Cheers
Dennis
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