my first thought would be yes more holes but make sure you aren't going to drop your heat with to many holes. also where is your water dishes in the tubs? if they are near the heat source try moving them away before making more holes. I put my water dishes over the hot spot when mine are about to shed and it jumps the humidity from 55ish to 75-80ish. just a thought but yes you may need to add more holes. good luck
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