Update: Both of the mods (steel plate / stack) that I shared in previous post are not needed, but, I like to keep the stack mod to keep grill exhaust away from me.
Below is the setup I used in my latest heat test, where I found sliding the back by 1 to 2” as shown below is my best option to get insane high heat and very clean burn, producing very minimal smoke from briquettes or wood chunks.
With couple of wood chunks, I got over high 900’s F right above the stone (1 to 2”), the stone was 3.5” above the cooking grates using Mighty Pizza Stone heat diffuser and the stone temp was in the 500’s to 600’s F (MPS adjustable heat diffuser screws set to the lowest setting). I need to raise the stone temp to mid 700’s F next time, I think that I can achieve that by placing all the charcoal below MPS in a mound. With that kind of temperatures, my average bake time should be around 3 minutes.