When operating my stove I like to let the wood get a little chared and then start closing the damper off. When I do this it runs very well but sometimes it seems it causes my temp of the flue to drop and then I am worried about build up. I also never close it all of the way...Is this advised? Most of the time my flue temp is around the mid 4's and the stove top is around themid to high 5;s.......Thoughts?