Well, my calculator does the same thing. When you get down to 2 IVs, it will tell you how many EVs you need to determine the correct IV. However, if you start trying to mess with the EVs before that point, you would just have to get lucky for it to actually help speed it up. Otherwise, you are wasting a lot of time trying to manipulate the EVs. That is another reason why I show the next helpful level where IVs would be reduced. If the next level will give you exact IVs, there is no need to mess with the EVs.