Any idea what the temp at the bottom of the tub is? I use a thermostat with the flexwatt. At 110 degrers, the inside bottom of the tub is about 95 degrees. The Dubias love it. That being said, I am in a very humid climate so likely I dont have an issue with drying out.
Do you have a temp gun to confirm the temps? An electric blanket may radiate heat more than the flexwatt?