High Humidity causing problems

[Concept9]

I'm a little confused as to why your heat lamp isn't burning off the humidity.

The humidity here is 74-85% cause of all the rain and heat we have had.

My snake is in a 90 gal. glass tank. He has aspen for substrata, one medium water dish. I heat his warm end one a 150 watt CHE on a thermostat at 90deg.

Even though the humidity here is high, this keeps his enclosure at around 40-50%. CHEs and heat lamps normally dry thing out.