This ceiling had a few high joist above the cabinets, we just make the ceiling work with the crown. The framing flaws disappeared.
Cutting out part of the ceiling to flatten it will likely create a ridge at the seam, which would also need floated. Drywall is flexible to a point, but not so much over a short span. I figured I can taper mud just as easily as trying to align two pieces of rock.
If you were to float it, would you do it under or over the Kerdi? Not so much worried about time for curing. There's other areas I can work while it cures.
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