I'm gonna call it a fail.
Here's the reason why:
When I used my OTG for pizzas, the only issue was getting the underside of the crust browned. It made good pizza's but I kept experimenting with more charcoal under the stone to get it hot enough to finish the bottom.
So, for this first time for the Kettle Pizza, I spread some coals under the stone.
The bottom of my pizzas were burnt - the last one, when the overall temp dropped to 500 deg or so, the bottom was completely burnt and inedible. The first couple were Ok, but not great.
It's a good lesson that changing equipment means changing techniques. We'll see how it goes next time...