Hey guys, i have a question, as i am trying to get my long burn times, i fill my insert 2/3 full, i would say 5 or 6 pieces, with a good coal bed. I get it going pretty good, turn it down all they way. After about a hour it gets to about 700 temp range, and this is the air all the way down. It stays at this temp for about 30 to 45 min then going back to about 550 or so. Is this too hot? am i putting too much wood in, should i remove 1 piece? I appreciate the help.