Need advice on this tank setup. Humidity through the roof. Please help!

[ragenarok007]

Its an 80 gallon tank with a fitted acrylic partition in the middle which effectively turns it into two 40 gallon tanks. Its 21 inches tall, 18 inches deep, and 48 inches long overall. We fitted acrylic lids to the two sides. This makes the humidity on the ball python side go up to 95% with an open water dish. The heating element is an UTH 30-40 gallon size.

On the other side is a young corn snake and the temperature and humidity is right where it should be with no heater or anything. It just warms from the ball python's side. The acrylic lid holds that temperature in.

So with the lids I have to install ventilation fans. That keeps it down but then it gets the other side cold. If I put a heater in that side it will also have to have a fan.

Anyone have any suggestions?

P.S. This is my brother's set up and he's very partial to the lids.