When the stove takes off it is when the back of the fire box secondary kicks in. this is why it takes about a hour for the stove to start to get to hot. I have tried pulling the coals to the front loading N,S behind them which does take longer for the rear to take off but eventually it will still do the same thing. I know using the key damper does work I'm just not happy with how to runs while doing this thru the entire burn. I have multiple sources off wood stacked up I have very dry smaller splits of maple that are around 15-16% on average checking a fresh split and I have larger oak splits that are between 18 and 22% on a fresh split. I usually put some smaller maple splits in the stove and load some of the oak on top of that. If i load the stove east west it will eventually disco inferno in the rear as well. I've read thru the glass wash plate thread a few months ago I looked at mine and it has about a 1/4 to 5/16 gap across the glass square the entire way.