We purchased a home that has this stove. We have replaced both gaskets on door/window, cleaned the blowers, pipes etc... and are still getting a dirty dirty burn. This stove does NOT have a manual draft adjustment, it has the A,B,C buttons on the control panel, can anyone tell me how to use those to set the draft and auger speed please and what the best settings are? We are burning Propellets only, no corn. Thanks bunches