Knew that about the galv but thought there was still diff in other grades of steel. I know a guy who welds custom smokers and thought he told me once that there is a special grade that has to be used so you don't poison yourself.

doesn't really matter.
Anyway, why not use a pizza stone rather than steel? I would think the stone would crisp it up better as it would probably take on some of the moisture from the crust.