I cooked with my door open and the flue wide open the ribs near the flue were over cooked and the ribs near the fire box were perfect. I did let my fire get away from me once. I wasn't using tuning plates. I had too many ribs in there too so next time I will do one less rack and use a water pan near the firebox for one smoke. Then the next one I will try it near the flue.
With the door open, I think the air flow pushes the heat to the stack end. That's my theory. I doubt that tuning plates would change that.
I burn more wood , however, with the door open. I use small splits 10" long, bout as round as a beer can. Put a new one on the fire, bout every 20 to 25 minutes.
I'm using a water pan, I got a 16" loaf pan, that fits perfectly across the end of my cooking grate above the baffle.