We are using a Hoosier track tire on a 1/3 asphalt oval in the Modified class. We can buy two tires each race. How do I find the tires that will give me the stagger I want?

? I have seen other teams tape the outside edge of the tire, others tape the middle, other look at the chalk numbers, I see other teams start a race with sticker tires, I am totally lost... is it science or dumb luck?
Thanks