I don't want to hijack Cornishninja thread but I'm a new BP owner and I'm having some similiar temperature issues too.

Im using a 10g tank
UTH
Hydropharm thermostat set to 98
thermostate probe is on the hot side glass under the substrate
cypress substrate
temp probe under substrate on the cool side

The ambient temp reads 77
the cool side is reading between 74-78
im not sure what the surface temp on the hot side is (IR therm on its way). But the thermostat sensor is reading 98.

He seems fine. He's eaten twice and has shed once and moves between the hides regularly. My concern is that the temps might be to low. I'm thinking of putting a second UTH on the cold side and setting it to say 85.

Are my temps to low? Is there a way to insulate the tank? Will my two UTH system work?

Thanks