Mike and Tom! Thanks for the help. I obviously did something really wrong.
I'm game to try it again and shall check the flour and will try the different coal configuration.
Mike, your comment about using more coals on top than the bottom is news to me.
I always thought:
broil-coals on top
bake-coals on top and bottom
fry-coals on bottom
My oven at home heats from the top and the bottom.
Well, we'll have to experiment a bit more! Thanks for the help, guys!