Ok need some help understanding this. Forgive the long post....Started a fire today loaded up beech and ash in my Woodstock ideal steel hybrid, very well seasoned. Filled the fire box. 35 ft stainless liner from the basement wood stove up through middle of my house, so drafts hard. Especially when cold. I had her cruising along nicely in a black box cat burn (no flames). Pipe damper half closed and stove damper almost all the way closed. Stove top temp starts to get near 600 flue gasses at 500 and I close the intake air on the stove all the way (still gets some air, but basically had it on the lowest air setting), and closed the pipe damper all the way to cool it down and keep the burn where it is. I have a probe thermometer in my double wall so that’s where I’m getting the flue gas readings. Now things get interesting - stove temp stays around the same, creeps up a little but the flue gas temperature starts rising FAST. Goes from 500 to 1200 in like 2 minutes and I smell that paint curing smell. Outside double wall at the hottest spot was about 500 degrees! I call a buddy of mine, he says “open up the pipe damper all the way and the stove damper all the way. If that doesn’t work open the door - you need to flood it with cold air”. Sure enough I opened up the pipe damper all the way and the intake air halfway and the flue temp starts dropping immediately. What am I missing here? Only thing I can think of is I kept more smoke in the stove and that just got the cat going even crazier? Second time this has happened in 10 days and last time I warped the radiator cover pretty good. Aside from adding less fuel, what’s actually going on?