To add to my last post; I would recommend doing other people's recipes for awhile, and you'll start figuring out what works good together, what flavors you'll need bigger bottles of, etc, etc. You also might stumble on some flavors that just don't work for you. For example; I just can't tolerate caramel or cheesecake graham crust at the recommended percentages. Caramel overpowers everything else for me and cheesecake graham crust gives me a scratchy throat hit, personally. But my GF can try it and not get the same results as me, and she enjoys them.
So if I see them in a recipe I'm trying for myself, I'll cut the percentages in half (or more). It's a learning curve.
Are you mixing by volume or weight? Edit: I see the scale in your pic now. I prefer mixing by weight, too. Just seems easier to me. I have the same scale. It's really good. Just a heads up; If you use batteries instead of the power cord, just know that it will turn off after sitting idle (can't remember how long). Not an issue if you're between flavors/nic/VG/etc. But if you're mid-pour and stop to answer your phone or something, you'll lose your weight.