This is my third season burning a BK ultra,and I just started burning one week ago,I also had my chimney extended by four feet ,prior to I was running the minimum requirement of twelve feet.Anyway this stove has turned into a bigger beast than before stove tops of 700+ are easily achieved and the cat has never run hotter,often times hitting 1600*I even bought a new cat probe thinking my original was not accurate well the new one shows the same high cat temps even at the end of the burn I'm at 500*.Question can one reload ,or add wood when the cat is at 500* or more without leaving the bypass open,example open bypass,cat probe showing 500* or more add wood close bypass,and just let it do its thing or do you need to leave the bypass open and thouroughly char the wood and then shut bypass and adjust t-stat.I am running the t-stat at about 1.5 to 2 lately.Did the extra four feet of chimney make such a difference?Thanks