You can definitely add more holes if needed! A lot of holes doesn't hurt.
In my 15 qt, I have around 40 holes on the lid, and 30 holes on all four sides... LOL. And my humidity was around 70~80% during the summer. Now in winter, it's dropped to 60%.
If you have that level of ventilation, high humidity is not a problem. What what I understand, scale rot appears in high humidity with not enough ventilation, or with damp substrate.
I also believe that taking out the fake plant will help a lot. Humidity in the enclosure doesn't have so much surface to cling onto/there's more open air relative to the size of the water bowl, so it will lower.
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