Picked up a dutchwest non cat a few weeks back. Read all the post but nothing relates to my problem. I can get the stove up and running but I'm having trouble controlling the high heat temp. If I load the stove for a long overnight burn the temp shoots up to about 800 in the stove pipe. The damper is closed the air is shut off. I have a straight double walled pipe that's about 12-14ft long. I cannot lower the temp when the stove is full. Is my draft to strong? My wood has been seasoned 8 months.