It's not a lemon, it's a vermont castings.
The gasket material they used is too small honestly. The griddle one is way too small. The door ones...eh...they need to be beefier. They seem so smashed and lifeless, and this is on my new stove. Also you didnt mention how tall your pipe was to the top of the chimney from the flue collar on the stove. Also if you are getting it to overfire with the air control on the lowest setting and primary closed....I had the same issue - just move the 'thermostatic control handle(LOL)' back and forth a few times. It gets stuck sometimes. Ok, more than sometimes. It's pure hot garbage but you get the point.
That said though, you are going to get smoke being able to get sucked into the stove at various points. The gaskets do not make them completely air tight.
Wait till you get a puff back and see how non air tight they are. Ever heard the phrase F around and find out? Well, you can probably do this at stove startup whereas you have a ton of smoke pouring out into the little 6" flue that is even further reduced using a dbl wall stove adapter but I digress. Move the air control to the lowest setting quickly while your kindling fire is started but still super smoky, WITH the door closed, then switch it back to the highest setting quickly. Smoke will PUFF out from every opening. It's a blast. Or just simply start off with a weak draft and start a smoky newspaper laden kindling fire with the door closed. You'll see what im talking about
I was convinced to buy the cat. Because (list 50 reasons why the stove isnt crap). SO I did, and it still is a PITA to operate....so I removed the cat and plan to use it for 'shoulder' seasons whereas I must burn at lower temps and dont want as much creosote in the pipe.
I now operate solely on STT and feel. STT only tells you so much. When you feel those sides are really putting off the heat, and STT is rocking at around 475-550, that's where she likes to sit. If the sides are putting off mega heat and yet the STT is where it 'should' be, just let it burn longer like this or raise up the air control ONE notch.
Ive found that 4-5 medium splits added to a nice bed of coals, then you leave the primary open and the air control open until that group of splits catches nicely, is the ONLY way to operate this stove. Switch it to secondary at that point and make sure your air control is about 4 clicks from the highest setting. If you want to load it up full and not have to load wood for as long as possible, well....good luck. I finally realized 1. VC lied, this stove is not meant to have long burn times unless you enjoy babysitting a stove endlessly and still having an overfire 1 hour and smoldering black glass a few hours later. 2. The stove can actually somewhat work ok if you run it in a manner that IT wants, not what you want.
Keep that air control about mid way at all times. If you try to lower it, your glass will be black and your pipe will be full of creosote. If you go any higher....plan to babysit it, because when you see the STT rising fairly quickly you need to be there to shut it down. And DO NOT listen to people that say "well just do it one click at a time and wait 10 minutes". ERROR BUZZER: WRONG. You will overheat your stove. Lower it in 1/3 increments and wait 5 minutes MAX. So in other words if you are freezing and the stove has a nice bed of coals and fairly well burnt wood, if you raise it all the way up...you will overheat the stove if you walk away. If you lower it 1 click every 10 minutes, your hair will turn gray...fall out, and your wife will ask what that smell is. By then your stove will be mad at you and will punish you. Lower it 1/3 of the way, wait 5 minutes max and make sure the STT stops rising fast and stabilizes before stepping away from the stove for more than a couple of minutes.
^ all of this is after the stove has gotten going. You will need to figure out what works best for you until you build up that nice bed of coals.
My glass is about 5/6 clear, my bricks are their natural color except the very tops of the bricks/iron, the gaskets dont have chalky goo all over them. This is the way.