That's already very impressive for a Dob mounted scope!!
Is it a Dob with tracking?
You should not need a field flattener for planetary work, but some rudimentary tracking at least would be good. Also, probably more magnification would help. A 5x tele-extender perhaps. I'm telling you what I know from watching others do it and having some understanding of the process but at the same time having no experience at doing it myself (just to be clear about the high level of my ignorance).
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