While you want the pasta dough to be fairly dry, add an additional tsp of olive oil if it is too crumbly. Different ages of flour has different amount of moistures
Use the amount of vegetable broth based off how thick you like your soup. It's very thick and stew like at 6 cups broth, at 8 cups it is much lighter.
If you are planning on freezing/storing this soup use 8 cups of broth for the best results