Does this tell me anything about "hot or cold spots" in my unit? Placed 3 pieces in burner: far front, middle, and rear. The front piece was all ash, the center piece ( a smaller piece) rolled a little to rear and was almost all burned. The rear piece was maybe 40% unburned - it was black but still a solid core is visible. The front and rear dowel pieces were about the same size - similar to 90% of the typical pieces that were included with the smoker. There were two incidences of combustion at about the 30-45 min. mark. Not black smoke but heavy white smoke with the noise accompanying it. Temp. was at 250 F and 3 hours for break-in.