I would recommend ditching the heat lamp and just hooking a under tank heater (UTH) or some kind of radiant heat panel. All lamps tend to do is dry out the enclosure.
The thing you want to remember is BP's don't care about the ambient temperature of this enclosure. Ball Pythons only care about the surface temperature on the floor of their enclosure. Which should be 78-83 on the cool side and 88-92 on the warm side.
I'd recommend placing the probe on the surface of the warm side, over the heating element. I'd also recommend a IR thermometer for measure the surface temps of the enclosure. Something like this:www.tempgun.com/
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