I would not call you geeky. I love that you are knowledgeable! Weird how they are so sweet this year. I assumed it was because we were in a drought.It starts with the leaves but will generally kill the entire plant by late august.
Just because I'm a little geeky about tomatoes... Fun fact, Those you buy at the store are picked green at about 5% sugar. Real vine ripe tomatoes can exceed 15% sugar, but are generally in the 10%-15% range.