yeah I taped it to the heat tape in the groove. the people from who I bought it from said the same about raising the temp of the thermometer, just confuses me, because I assumed that's what the thermostat did was keep it at set temp the dimensions of the tape.
The guys at RBI are awesome. I have their equipment also. Sometimes you need to set the thermostat at say 98 to achieve the 90 you are looking for. Perfectly normal.