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Temperature adjustment could be the factor
If you scope is well-collimated, the problem could be temperature adjustment. Try putting the scope outdoors at least 1 hour before you start observing. This will allow all the components to equalise with the atmospheric temperature and hence minimise tube air currents. Also, make sure you run the fan.
In my experience, it is generally the case that the later in the night you observe, the better the seeing. Atmospheric turbulence gradually dissipates as the warmth of the day disappears.
I have a 12" GSO dob and lately have been getting great views of the Cassini division in Saturn's rings and so expect your scope should be able to achieve similar.
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