We have used stove 20 times heating nightly. We have a large amount of build up on firebox door and on top of oven and all around oven sides and below of the shiny hard type about 1/4 " thick . Our wood is dry mixed hard and softwood that has been in a barn for 5 years. The ash box if filled w/ fine ash completely burned. We have an infrared temp gauge and heat it up to about 500 degrees and leave air intake wheel open about 1/5 and the main damper closed and bring fire temp down to 300 degrees steady. We are not able to use the DS regulator in the rear as it does not work as video shows so we keep it fully closed and use only air intake from wheel on front door. I received a brochure with new stove that has nothing about DS regulator nor any diagrams. When I called Kitchen Queen they would only email us and gave us worthless guesses about adjusting chain. When we attempt to use DS we get no opening or closing on its own accompanied by popping noises or blowback of small amounts of ash from bottom of firebox. We have an inspected new Selkirk Ultimate Chimney system. We have tried using stove to cook but directions are unclear and opening and closing oven rod does not seem to help with creasote. We have Amish workers who are unable to adjust thermostat or explain build up The local dealer is new and unhelpful. Can we buy an original manual that matches the stove? Any ideas Help?