I've had ongoing problems getting my Jotul 3 cb to burn anthing above 500 degrees stove-top and I and the stove work hard to get it there, and I rarely, if ever, get secondary burn. I've tried many remedies and gotten all kinds of advice. My stove pipe is double walled six inch and goes straight up the interior about 20 feet to a cathedral ceiling and continues straight through the roof, a pretty powerful draft. The most consistant advice I get is that I'm losing all my heat up the chimney due to the strong draw and that an in-line disc damper would help keep the heat in the stove. First of all, does that sound right and worth the effort? And secondly, can I install a standard six-inch cast-iron disc damper in a six inch double-lined stove pipe? Are they compatible? What do you think before I start tearing things apart? Advice here always welcome and always helpful.