More holes. More air flow in the room. Smaller water dish.
I have 2 rows of 1 inch apart holes that go around my tubs and I get perfect sheds. The natural humidity in my area is ~50% anyway though. Some people have more or less holes than me so it really depends on your room humidity too.
But honestly, as long as there's no standing moisture or condensation on the sides, I wouldn't worry about humidity being too high. Hygrometers aren't that accurate unless it's science or musical instrument grade so the reading could be off.
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