A couple questions I would have are:

1. What are you using to measure the temps? Is it a digital thermometer or the stick on dial kind?

2. Where are you measuring the temp? For example, if you are measuring the air temp above the warm side hide, getting a reading of 92 while heating with a UTH, it could be too hot inside the warm hide.

3. Do you have the UTH hooked to anything to regulate the temperature? Thermostat, rheostat, dimmer, etc??