One Ai trait is that they brake u r just about to overtake or juz overtake them. As such, whether it is late braking or early braking depends on ur relative position to the Ai. If u r tailgating, brake a little later to overtake during braking. If u r a distance away braking juz on time or slightly early braking can be helpful to avoid collision and get better exit speed. For Suzuka, let go of throttle before the sharp hairpins. The driving line can help. A ballpark time is 2:05 each lap to get number 1 on last lap. so no rush. Some do it at 2:00. I generally hover at 2:02 now. That shld get the lead by 4-5th lap when I redo the race in my other acct. For Rome, lead comes later usually at last lap ( so patience) while the other 2 u can probably lead by 3rd lap. Good luck!