I am running the F3 this evening and after the first 40 minutes or so I closed the air down by 1/2, 1/4 and then fully closed. The secondaries started as bright orange shooting out as nice jets from the secondary ports. About 1 1/2 hours later, the secondaries are lazy, less intense but blue with flicks of orange. Can anyone tell me if the blue indicates starving for air or is it just the stage of pyrolisis it is in? The stove top temp has been hovering around 500* pretty much the whole burn cycle with the primary air closed. Anyone notice this with their stove or insert? I am surprised how even the temps are running off this stove. I am using maple uglies and shorts.