less than 10% moisture content is real hard to control in the newer stoves. Most only have a limited control of the main combustion air supply and none what so ever on the secondary. with a full load things get out of hand very quickly. I had some very dry- didn't measure it - red oak in the nc30 closing the main was of no help but mechanically blocking the secondary intake got things under control. part of the problem was the 30-50 mph wind blowing at the time also creating excessive draw. I have run into this on other stoves over the years as well. Pretty rare around my parts to have splits less than 12%- and that is stuff that has been sitting in a barn or similar for several years. Most of the time I am fighting to get below 20% due to mother natures whims.