Forgive me for being stupid in the head - I never asked about moisture content in your wood. It looks like you're burning wood with a really high moisture content. These things need really dry wood to do their magic. Try getting a fire worth of really dry wood from somewhere - 20% moisture maximum, and see if it behaves differently. Based on the amount of condensation, I'd guess that it's not gasifying much of the time, especially when coming off idle. If you open the bottom door when it's running, you should see a large bluish flame with orange fringes, and a sound like a jet taking off. Any gas that comes out should be odorless.