Just wondering if my burn is as clean as it should be. Put in 3/4 load flue temp to 475 and stovetop at 550 cut the air back and I am still getting wisps of smoke out the chimney. Usually with smaller loads I don't get any chimney smoke. Outside temp is 15 degrees. I have lots of blue flame in the top of the box with some yellow flames off the front of my wood. Just basically wondering if I am getting a clean burn with a little smoke out the chimney. If not, any suggestions on what to do.