Dumerils- humidity concerns

[KWenger]

About six weeks ago I got my new T10 cage from Animal Plastics (48x24x15) and I really love it. I ordered it with an overhead RHP (radiant heat panel) and am very satisfied with the set up. Quality is excellent. I of course am controlling the RHP with a thermostat and have it set so that the warm end is around 85 and the opposite end stays around 76-79. I think that's about right, don't you? My concern is the humidity level. In addition to two hides, one at each end, I have an 8 inch round water bowl in the middle of the cage. The humidity consistently stays in the high 70s and NEVER goes below 70%. MUCH higher than when I was using a glass tank to house my Dumerils. I realize an advantage of a plastic enclosure like this one is the superior insulation qualities (compared to glass) and ease of maintaining humidity levels. But is the humidity in my cage too high? Maybe the water bowl is too big and is causing too much evaporation? What do you think? Not sure how to reduce humidity as I've always had the opposite problem. Also, I have two hygrometers in the cage and both register about the same.