My insert instructions state to wait until the probe temp gets to 500 degrees before engaging the cat. I normally start to shut the damper down when the probe is between 600 and 700 degrees. The probe temp falls as soon as I start cutting back on the air and will usually drop below that 500 degree level even with the secondaries going pretty good. My question is, if I want to add wood a bit later, do I need to get that probe up above 500 before re-engaging the cat (I disengage befor openning the door). I do after the overnight burns because the probe temp is usually below 200, but I wasn't sure about when I just want to add some wood to what is going already.