Im loving everything about my new Lopi Freedom with one exception.When ever i load up the stove for a long burn and back off the air supply(after getting the temp to about 550) the glass gets completely covered in soot,to the point where you can just about see thru it.Upon reloading and getting it back up to 550 most of it is burned off.Any suggestions on how to avoid this? The wood is about 15-18 percent moisture content.Thanks guys