I also have a Super 27 and I've always felt like it gets too much air. At first I thought I just had a super strong draft because I have a tall chimney and the stove is in the basement but after a few years using the stove and seeing other people's stoves with similar setups I think it's a combination of too much air and strong draft. I can't load my stove full because if I do the stove will go nuclear on me. I had to put a damper section in the pipe so I can control it better if it does take off on me.
I've done the dollar bill test, checked for cracks and checked for leaks but haven't found anything wrong. I know two people who have similarly sized chimneys with wood furnaces in their basements and they don't have any problems at all. Of course they are also burning wood that they call "seasoned" which means they have a truck load of tree length wood delivered in the summer, cut it/split it in October and burn it that winter. So who knows what would happen if they were cramming their furnaces with my wood which is all very dry. I was actually told by someone that my wood is too dry, that's why it burns too hot. Maybe they were right, maybe I should start mixing in a few greener splits in.
I know people are going to want to throw things at me for saying this, but I've done that with a level of success. I just have thrown a green split mixed in with very dry wood to slow it down a bit. This was oak that was super dry, and would go through the roof if loaded without something green. In retrospect if I had split the wood larger I would not have had this problem. Split size truly effects the rate of outgassing.