I'm convinced those Condar probe thermometers are not accurate and read on the high side, especially at higher temps. They have that spring dial thingy under the dial that is greatly effected by radiant heat off the plate steal or the cooler air from your blowers. Turn off your blowers and just put your lips together and blow on that thermometer, I bet the temp will drop drastically. A real thermo couple would be more accurate, these Condar's are just a guide. I would just ignore those higher cat temps, your all probably fine unless the probe is pegged for a long time or you have a raging inferno going on inside.