I don have any experience with a rotary but with the DA I suggest speed... Speed is needed for correction. You have to break down the polish and correct the paint.
I use speeds 5&6 for SIP
For 85rd I use 5 but as I finish the section I will slow my speed a little.
Once you get some experience you can adjust your technique to get the results you want. A lot of times I don't pay attention to speed. I look at my results and adjust my technique to get the results I want.
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