I have a 25-pvdc/55-shp10 englander pellet stove, the stove aggressively over feeds on the lowest burn air settings righg now i am at 1-7-1 and it feeds as if i have it on the highest setting, the bottom auger is overflowing with pellets at all times-although they all burn up in a huge bonfire so i dont believe its my airflow, i think pellets may be falling down from the top auger (which was replaced at some point by the former owner) to the bottom but im not sure how to fix this problem please help if you could