Tran et al
OK, I have never even seen one of these much less cooked on one, but being intrigued, checked out their website. So the lightbulb that went off may not apply, but here is what popped into my head.
Why not replace your upper stone with an additional heat source? You already have multiple shelving arrangements figured out. So some type of pan/container full of screaming hot lump charcoal 2 1/2 inches above the pie could work and might actually get the temp above the pie hotter than the stone below. Sounds too simple so that means there are prob a few dozen problems to work out. But if anyone can figure this out it is you Dr Tran.
Maybe a hairbrained idea but the first one I have come up with that might solve the "all the heat comes from below" dilema.
I'm being serious here, but that is the craziness idea I have ever heard! Have lost your d@mn mind man? You're gonna put someone's eye out! No really, that is quite brilliant hog and I'll have to give it a shot. I really like this crazy idea!
I'll have to wait till the fire is about half active and shovel some of the coals into a side pan, build up the hearth and walls and use a metal baking pan for the ceiling. I would then shovel the coals on top, shut the lid and let it all bake for a bit to get the temps nice and hot.
Only 2 concerns. Could putting a heat source that close to the ceiling crack the primo oven. Possible but not likely. The whole oven is made from the same material as the firebox I believe so it should be ok.
Heat rises, so would the heat generate off the metal pan be more than the heat I can trap from below? Dunno but possibly. Remember the heat coming up from below is registering 850-1000F depending on what material I use for the hearth. Only one way to find out. Hmmm, guess I gotta do it now. Thanks Hog.
BTW, these ovens are very cool. Pizza is only one of many things you can do with them. It makes killer bbq.