Wood is a really good insulator so a UTH is unlikely to be very efficient I'd actually say your temps on the hot side are approaching too hot.
The issue is very very few people own an accurate thermometer 90% of the digital ones on the market can be as much as 2 degrees off up or down at 91.4 could be 89.4 or 93.4. Truly accurate digital ones do not use resistive sensors. That makes them quite pricey and typically are traceable and that requires a serial number.
What makes you think that he has problems digesting? Where is he typically found on the cold side or warm side?
There are heat mats that are regulated that can be placed inside the enclosure if you are dead set on changing it.
http://www.bigappleherp.com/Kane-Heat-Mats_2
They are quite large potentially too large and must be controlled with a thermostat and a proportional one is HIGHLY recommended! This is a costly operation for a problem that might not actually exist.
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