Every night I set my Profile 20 stove to low while I sleep, when I wake up in the morning it is always overflown with a lazy orange flame. I am noticing that I can set the stove to medium or high with the damper almost all the way in, the flame will burn correctly and not overflow. When I switch to low, I need to pull the damper almost all the way out, and still it sometimes flows over. Any ideas?