It has to do with your reaction times. If your slow off the line your raise your tire pressure, and lower if your too quick. So not only do you monitor your rear pressure according to DA, but your front according to yourself that day. I have at least 3 trip 0's so far that I can remember. That's .000 on the tree. My fronts would be anywhere from 26-32 psi depending on my skills that day. My rear Hoosier and MT's were always around 15 psi. Hope this helps. Glad to hear you have a rocket now. Enjoy the duals.