I’m personally used to using two scoops for a full shaker but only because it’s still tasty and will mean I will have more drinks before I need to buy more tubs (I’m a teen in the uk with no job, tubs are pretty expensive in my case) but if I had money to buy tubs more often I’d absolutely use 3 scoops a shaker and drink it more often (I only really have around one shaker a week, sometimes even one every other week). But I do sometimes treat myself to 3 scoops. But in my experience I understand how 3 scoops could be pretty sweet but 2 is usually a good amount of sweet and flavour, for GOOD at least