Sprinter
Minister of Fire
Halfway is probably asking too much. Try closing it down just a little off the bottom and play with that a little and work your way up. It may not take much to make a difference. I know it doesn't take much for my stove if I need to bring it up a little.Well, it'll mostly chew through wood. I just got home from work. So i can load it and only close it about halfway to see how it behaves
Back to the OAK thing. Is you house especially tight? Do you tend to run kitchen and bathroom fans? Or a dryer. Those can draw a lot of air out of the house, sometimes starving a fire if the house is a tight one.