Zoo med Rheostats are junk. What you want is a thermostat.
Budget: http://www.amazon.com/gp/aw/d/B000NZZG3S
Mid-range: http://www.reptilebasics.com/ranco-etc-111000-pre-wired
Best: http://spyderrobotics.com/home/products.html
Unlike rheostats thermostats automatically adjust the power going to the flexwatt keeping it at the right temperature.
I would suggest that you keep the substrate layer as thin as possible 1/2" or less. Otherwise the flexwatt won't be able to do its job properly.
BP's will dig into their substrate from time to time. If the floor of the cage is too hot (above 95) they can burn themselves.
Does your cage have a fluorescent light in it? If not I would add one. It will raise the air temperature a few degrees (you want it to be 78-80 degrees 75 at the lowest)
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