sacs, I am so glad I have been able to help you. Sometimes I wonder if people here are annoyed by my opinionated attitudes towards certain pizzerias/brands/etc, and your post makes me feel good!
Up until a few months ago Cento had what I would consider to be the absolute best retail tomatoes sold in my area. It was not the top of the line San Marzano tomatoes, but the Italian whole peeled tomatoes that were so good. The old cans that I love have a code stamped on top that says ROA 1 PELATI. That code tells you who the packer was. The new cans have a different code on them, and are definitely not as good as the old ones. Still, Cento is a quality brand and the new products are still far superior to most of what you can find in your grocery store. I have to check, but the new italian whole peeled seem very similar to the old Cento San Marzano's, so it could be that they are now buying all their Italian tomatoes from the same packing plant that once sold them their San Marzano's. I guess the answer to your question "are they still worth buying" would be yes, but they are not quite as thick or tasty as they once were. They are now more acidic.
This brings up an interesting point which is that many canned tomatoes I see are actually the same tomato with different labels on them. The most common can code I see is STR, which stands for the Strianese packing plant. Sometimes the tomatoes actually have Strianese label on them, but many other product names and brands can be on these same cans of tomatoes. I would love to find out who ROA is, and if any other companies bring their products in to the USA. If we can figure out who this is it is possible that they sell the exact same amazing Italian tomatoes that Cento once used.
I have a feeling your Jersey made mozzarella will outperform the Bel Gioioso. I love the flavor of the BG, but the texture never seems right to me. The best thing you can use would probably be the buffalo mozzarella, but you have to get it when it is fresh, and that is very hard to do here in the US. The only brand of buffalo mozzarella that I don't like is what is sold at my local whole foods called Buffalus, or the American brands made from Buffalo in Vermont or California.