Like Lee mentioned, some bags are worse than others. And I too have been using it as a blanket to cover the hot bed, but this morning, the blanket was "heavier" than normal, and has been really choking the coal bed out. I think it was 10lbs of fines, but I couldn't confirm, cause it got buried in the pour. Next time, I'll be more careful on how I load TSC Reading nut coal to the stove.
It's "almost" back to normal since the addition of the Lehigh stove, but my dampers are still a little more open than normal. I'm thinking after tomorrows dedicated shakedown, I'll be ridding it of the tumors.