When Norma and I and some other members were active on the Mellow Mushroom thread, we found that the weights for real MM dough balls we're all over the place. And that was for dough balls made by commercial equipment. It still puzzles me how machine-made dough balls could be off so much. But, that said, being off by an ounce or two on the medium dough ball weight is not a disaster. I used to make decent Papa John's clone pizzas using 21 and 22 ounce dough balls (for the 14" size) until I discovered that the real PJ dough balls weighed 20.25 ounces plus or minus a quarter of an ounce. For reverse engineering and cloning purposes, I would suggest a dough ball weight of around 20 ounces, just to be more accurate and precise.