Will do. When do you turn on the fan? When I lite the stove or later when the flue is up to temp?Are you saying you have not utilized the factory fan? Why? It is known to make a drastic difference in heat distribution in many cases.
Run successive batch's. Start with the fan on low.
Next batch run the stove fan half way to the middle position.
Next batch run the fan at the middle setting.
Carry on etc.
Report whether this is a worthy improvement.