My first bp was in a tank with locking screen. Had the whole humidity problem like normal. I'm sure there are alot of member's that can tell you there trick's. I had to ghetto rig my top to keep the humidity right (which never reallly worked). Misting daily is a pain and is temporary, once it evaporates your back to were u started.
You could try and put a nice size water bowl on you hot spot. Or, you can convert to a tub with a snapping lid. Solves the humidity and ambient temp issue.