Lights, plus the screen top is murder for humidity I've discovered. I have made a plexi cover with just enough room for my 75watt bulb to shine through on the hot side in an effort to keep humidity in. It's worked ... a little.
I would like to do more UTH and lessen the bulb wattage (I need to keep using lights unfortunately, because of cold house). Many people on here use flexwatt tape and seem to like it. I think I will try that. How thick should my substrate be on the side I use the tape? I have aspen bedding in the tank now, with some unopened reptile bark I could switch it out for if it does a better job with humidity ... thoughts?

And how hot does the tape get??