I don't change the zoom, but i do the same thing carl. when i look at cat's ss, i'm noticing overall changes in color in the ss. i just scroll through without looking at individual numbers, and you really can see the overall picture of the cat's BGs by the color changes.
of course i'm looking at individual numbers when talking about dosing, but you can get an overall picture of how the cat's doing when you look at the colors.