You may not be getting the correct readings, as those stick on dials are HORRIBLE. I run a $12 Accurite Digital Indoor/Outdoor Thermometer/Hydrometer (most people here use one). You put the unit on the coolside, and tape the probe on the hotside, directly on the UTH using aluminum tape. If you aren't using anything to regulate the UTH, there's a pretty good chance the temps are going to be WAY higher then what those dials are reading now, potentially dangerous.
To help with the humidity, you can put a few layers of aluminum foil, shiny side down, on the screen top. Be sure to remember to cut an opening one side for ventilation. Pm Argentra, she sent me an excellent step by step tutorial on how to make a cover with aluminum foil and duct tape, and was very helpful.
Edit - the Accurite does not include batteries, so buy a pack of those too![]()