Help with home built stove

Hey guy,
I'm new here and I'm really struggling with a wood stove I built. I built it from a 300 gal propane tank.
I got plenty of pictures if anyone needs them. I get awesome heat but when I open the door it smokes like crazy... It's made like a double barrel with a 18" pipe laying on top of the tank.. I took the baffle out of the top tube, I added 4' to my stack yesterday and none of this help at all...
Please help...
Thanks..
jeremyleaton@gmail.com
Text 270-776-4616

Jeremy, is this a traditional wood burning stove, a rocket stove or something else? Is it an outdoor (open chimney) or an inside flued stove?

It's just a typical wood stove, just large.. It's inside my shop with a 8" stack going out.

Wow! That's a big chunk of steel! What height of chimney are you using to create draw? Is the chimney insulated? If you are in a colder climate you can really fight against cold chimney pipes not wanting to draw upward. You may also be having issues if the design is too tight with no air intake at all.
How big of a burn have you done, and at what stage does it seem to backdraught the worst?
Sorry for all the questions, it just helps to know the bigger picture.

The stack is right inches round and is about 20' high. It's now about 5-6 ft above roof.. Yes, there is an intake. It's a 6" square and on bottom left side behind the faceplate so you can't see it in pictures... It feels like it draws good, but at anytime you open the door it will smoke.. I usually open intake wide open for a few minutes first and this helps but doesn't stop it.. Yes I've had some real hot burns and I'm in Southern KY so the stack is warm and I never let it go out. I keep it burning around the clock.
Thanks
Jeremy