Just after 3 tons, I am getting this lazy burn. Now, not a bad one, but the pot is filling with ash on day 2. Clean and bush it out, I get a good burn, but this dosn't last but a day and I am right back. Did the leaf blower thing. Good burn, but not for long. OAK is not obstructed. (ran a lint brush through it) Hum, I have burned 3 tons, done the leaf blower thing three times. Clean the inside of the stove out every 3ed day, now every second day. Did the dollar bill, fair seal. Uh, must be time for the big cleaining. So out comes the blowers. I take the vac, brushes, and steel wool to every nook and surface I can find. Inside the blower chamber is all black soot. Not thick and wipes right off. I tap on the back of the burn chamber, vac everything again. Put it all back together. That was Monday PM. took me two hours. Sove is still running really well. No accumulation in the burn pot. I don't know how that layer of soot made such a change, but it did, and now that it is gone, it is all better.