If you have dull areas when using a satin finish, it sounds like the coverage isn’t as good as it should be.
When painting cathedral ceilings, even with an extension pole, the leverage isn’t as good, meaning that you may not be able to press as hard because of the height. Painting up and down in the same direction is the way to do it.
It sounds like the ceiling needs another coat.If you are putting a satin finish over a flat primer, the satin will soak in. Your second coat will give you the true sheen, taking away the dull spots.
The only other problem could be the thickness of your roller cover. 1/2″ is good for drywall.
Good Luck!
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