If you haven’t yet, find listings for some of the flavors and see if the ingredients are given. I don’t think there used to be so many with sweetener added as there are now. I also suspect that bakery is the worst offender, because they’re often more complex - cheesecake flavor seems to have a lot of sweeteners, where graham cracker not much, if any, and my guess is that’s due to complexity.
When I need a break from all the sweetness I go with toasted almond, maybe hazelnut, stand alone. I’d love to find a good coffee too.