Ryan, hold off on the croaking too soon. We're depending on you to help us perfect our pizzas! This is a group effort!
I too am using 2 layers of fire bricks staggered under the Lodge cast-iron 14" pizza pan or a traditional stone in my older Genesis gas grill. Results are pretty good, but I'm not quite getting the spotty charring on the tops of the crusts that I'm looking for.
The trouble is that the angle of the front of the Genesis lid limits how high I can raise the Lodge or a stone and still be able to close the lid. If I could just get another 2 or 3 inches in height, I think I'd get what I'm looking for, but then I couldn't fully close the lid.
I have a couple of things in the back of my mind that I still want to try. Stay tuned.
Rita