I built my owb about 8 years ago from an 800 gal bulk dairy tank and a 400 gal air tank torpedoed into one end. This year I switched from green nasty whatever hard or soft wood was available to 1 1/2 year old dry slab wood. I have had problems smoked out the neighborhood BAD. I am using a 6" stack with a single pass through the water that only extends a couple of inches into the firebox then on the offending end goes up appx 15 feet. The smoke is especially bad just after I stoke up but I would love to reduce even "up to temp" output. I did also add a temp controller this year but it is cycled on during the periods of bad smoke. The gas off the stack is flammable (wood gas) about 15 min after a stoke but after about an hour it has settled down enough to not burn. I am looking for solutions to this smoke issue without a total rebuild, since the commies have come up with regulations that I am grandfathered from. I probably could call any next generation burner a "repair" as long as I used some of the same components. A couple more tidbits for what they are, the fire box is completely surrounded with water, I do not use a grate or ashpan but rake out a couple shovle fulls and pile wood onto the ashbed in the bottom. Any help would be great.