hello, I have finally finished my backyard oven (barrel type out of fire brick) and have fired it up three times, achieving a floor temp of over 700 degrees . I have not insulated it yet and i believe it will approach 900 when I do. My question is about my flue on top. I have an 6X6 clay flue, 48 inches long, just sitting on top of my dome, and I am going to fix it in place, BUT, from the posts there seems to be discussion on running a flue straight up vs running them back at an angle. My gases coming out are over 200 degrees, would it help to insulate the flue with ceramic blanket, and cut it so it leans backward at an angle coming off the dome?"