I have that very same cooker and have learned a lot on it. Don't use it much anymore though, to many other cookers. Anyway, I modded the heck out of mine. 1st a charcoal basket which sits on the charcoal grate which I raised about 2"
Then a short baffle in the smoke chamber
5 tuning plates 5" x 16" x 1/4" thick, these help greatly to control the temps. Can actually get the end farthest from the firebox hotter than the firebox end. Sometimes I use all 5, sometimes fewer. Depends on what is cooking
Removed the factory 3" stack, plugged the hole and then put this 4" x 36" stack on the end and below grate level.
Bigger pneumatic tires all around and two thermometers mounted just above grate level on the quarter points of the door completes the transformation.
Oh yeah, this was taken before the addition of the 13" tires near the firebox and the shelf in now Mahogany.
Jeez, now I want to cook something!