Bill, do you have a lever that controls the flue or direction for the heat to circulate around the oven for more even heat? One way is a lot more direct to the stovepipe. Mine is at the top of the oven door, right under the stove top. Also do you have a little slide gate in front of the firebox that lets air through the firebox, directly up the flue? I open this to start the fire, helps get a draft going. Start a very small fire, slowly build up the fire to warm the pipe for better draft, then close. You may need another length of pipe outside. They call for a certain height above the roof pitch or peak for a good draft....James