The tray tonight was outstanding. Substituted honey for white sugar and the dough is excellent.
Anyway, I measured everything today during prep & topping.
Sauce: (1) 28oz (793g) can of crushed tomatoes, 120g of finely chopped white onions for a total of 913g. I can top 3 trays per can so each tray is topped with 913/3=304g of sauce per tray (approx 10oz +/-).
Cheese: the 50/50white cheddar/mozzarella cheese blend is spread at 8oz (14g) per tray.
With these weights, it should be possible to turn out a consistent product every time. I followed these measurements today and the tray was excellent. Perfect balance of cheese, tomatoes/ onions, and a soft chewy dough on top, crispy & browned on the bottom.