I haven’t done sauce a bunch of times, because it takes too much time and Trader Joe’s sauce is good enough, but in the times I have, I’ve had pretty widely varied results based on the tomatoes going into it. It’s not exactly mind blowing considering it’s basically tomatoes cooked down with some spices, but I don’t have anywhere near as much variability in most other cooking. Mushrooms are mushrooms, flour is mostly flour (except I really like how 00 pizza flour comes out). Obviously there’s always variance in the end result based on ingredients, but tomato sauce is one of the worst I’ve noticed, so finding the right source for that might be worth thinking about if nothing seems to work recipe wise.