I am experimenting with burning some skids in my quad. What I find is that I can close my primary air control the whole way and still achieve 300 + degree stove top with good secondary burn. It seems to me that doing this takes away any draft that was felt in the house. I guess this is what it is like burning very dry wood..... which brings me to my next point. Is burning soft dry wood with controls closed better than burning 20% hardwoods with primary cracked open?