I am still having trouble with the Woodgun chugging, if I open the door a bit it stops chugging and seems to run great but If I close the door and open the air inlet damper all the way it it chugs like crazy. AHS said to close air inlet and that is what I have been doing but it seems to cause a lot of little charcoal bits to get into the smoke pipe and flue and actually clogs it up. Isn't this an obvious sign of burning rich and that more air is needed? If opening the door solves the problem is this not another sign that more air is needed, What if I geared up some type of blower to force more air into the air inlet than is currently being sucked in such as a leaf blower? What about a more direct, smoother flowing smoke pipe than the design suggested in the manual, which is approx. 4' up, 4' perpendicular and then another 4' perpendicular again? This even occurs with 4-5 8" rounds , all my wood is extremely dry maple, wood room is 90F all the time.