I've had my new Dutchwest non-cat (large size) up & running for about 2 weeks now, and I'm running into 2 mutually exclusive problems with it. Feel free to suggest on either/both. The flu is rear-exit with about 12" distance from the flu collar to the chimney itself, including the thru-wall connector. The first problem is after a reload/new fire and getting the reburner to engage. I load up the stove, leave the damper open (reburn chamber off), air input at full, and let the thermometer get up to about 450 degrees. The thermometer is sitting on top of the thru-wall connector for reference. Once up to temp (about 5-10 minutes for an existing fire depending on conditions & wood), I shut the damper to engage the reburner. Most times the reburner engages (there is a characteristic combustion noise and draft noise), the temp rises about 50-100 degrees very quickly, and the visible emmissions at the top of the chimney disappear (nice clean burn). However over the next few minutes, the draft noise stops, the temp drops to about 300 degrees (from about 500), and visible smoke starts coming out of the chimney when the temp drops below about 375. I can crack the ash pan door (not visibly open, just enough to unseat the seal and let in a little extra air). Sometimes this gets everything going, sometimes I have to reopen the damper and start the process all over again, sometimes several times. The next problem is the reverse once the reburner is operating nicely (no visible emissions), and the thermometer reads about 450. For whatever reason, the temp starts rising rapidly well into the red zone, rising to about 600+ degrees very quickly (just under 2 minutes). I can crank the air inlet all the way down to closed, but that at best lowers the temp to about 525 (still in the red zone). This persists as long as 2+ hours until the fuel inside is reduced to a hot bed of coals. The chimney (masony w/ a clay liner) is so hot to the touch on the outside it will burn your hand. I've tried adding some less-seasoned wood when re-stocking the stove, but it doesnt seem to have a noticeable impact. If this was an older stove I would suspect the seals need to be replaced, but this stove is nearly right out of the shrink wrap. Thoughts?