Regarding the wood: I learned early on that a secondary burn won't last unless there is a GOOD 2" of glowing coals in my stove, with seasoned wood on top arranged so that air can pass easily. Unless you have a good bed of coals, as has been mentioned, the secondary burn will struggle and possibly die. I USED to rely on a thermometer (and kind of still wish I had one), but no (2) ever read the same temp while on the stove at the same time, and I gave up trying to "calibrate" them, so I go old-school and rely on the feel, time of burning, visual evidence thru the glass, etc, to manage the burn. Works great once you get the knack. What I DO know is a high-temp, one that you THINK should sustain a secondary burn, can be achieved many ways, sometimes quickly, but may not include that bed of glowing c oals. That's the key.