Finally got my 43 at Toyko.
Since it's not too much fun when your only competition is either somehow using SRF or riding the walls, here's a few pointers.
T1 - The moment you pass under the 200m board, brake hard and straight. When you get to the 50m mark, you want to turn using 2nd gear and float the car towards the apex. While you can stay in 3rd, I find the nose turns a lot better in 2nd, allowing for a more aggressive exit.
T2 & T3 - Braking point is right at or just before the rumbles begin on the right. With such a wide track, you can angle the car slightly toward the corner. The temptation is to carry as much speed for the left hander. However, you want to keep the 458 more to the left, even if it means sacrificing some speed. The reason is because if you get it right, the following corner is wide open throttle. If the car's rear steps out a bit, even better since it only gives you more rotation. I would not advise touching the rumbles at all at any point, especially the ones on the right hand side.
T4 - There's different ways to handle this u-shaped corner. I like to turn when I hit the 40 kph road marking in between the 100m and 50m boards and keep turning while braking hard and downshifting. From there, it's maintain speed until reaching the second set of white billboards on the left side. This is roughly the spot where you want to lift off completely and get the nose pointed for a fast exit. Depending on where you are on the track, you may be able to go full throttle from here without having to lift again. The more to the outside you are, the earlier you can add power.
T5 - Brake around the 50m board or a little before if you keep pushing wide on entry. You want to quickly get down to 3rd and wait until you reach the crosswalk markings. That's around when you can get back on the throttle again. Avoid turning too much, though. There's more room on the exit than you think.
T6 & T7 - The wonderful S turn. I've seen a lot trying a more straight line approach which I haven't tested much. I'm more used to my way. Basically, I line up the car left and wait until I reach the yellow Pirelli billboards. I then back off the throttle a touch and aim for the first apex to the right. The moment I touch the strips, I dab the brake and yank the wheel hard left. It's a test of bravery since there's no room for hesitation and believe me when I say I smacked the second apex because I mis-timed my turn in. The reward is gobs of exit speed, however. It is something that requires rhythm so I suggest using the warm up session to get a feel for it.
T8 & T9 - Turn 8 is a struggle. In fact, the way I did it during my 43 was probably the best I've ever done. You have to start arcing the car as you approach the 100m board. You want to brake and downshift but be deliberate about it. You want to carry the momentum into the corner and hope you can clip the apex curbs a touch but not run them over. At most, straighten up the corner for an instant on exit because you'll have to start the approach for T9. Like in T4, lift off the throttle for extra rotation. When you exit, keep the car closer to the middle of the track because it will help you nail the next section.
T10, T11 and T12 - The setup is key to everything. Again, you want to be closer to the middle of the track exiting T9. That's because T10 can be taken flat out in ideal conditions. You can't be afraid of the barriers so attack the apex aggressively. If you think the car will understeer too much, then back off the throttle for an instant and get back on it. T11 is more difficult because you have to hug the right side of the track in order to get T12 right; there's not enough time to go wide and re-establish. I always do a little lifting at T11 for consistency's sake.
T12 is the money turn. See where the shadow and light intersect at the right side of the barriers? Your braking point is just before that. The following sequence is a tough one: quick downshift, brake straight and hard for a moment, turn left and ride it out until you reach the apex. Like the S-turn, you absolutely must commit to the apex. Once you reach it, accelerate. Quite satisfying when you get it right!
T13 - I feel like I botched this turn during my run but the lap time says otherwise. I've had runs where I braked right at the 50m board and made it but in most cases, that's too late. My impression is that you want to carry all the speed you can going into the turn. You can go a little wide if you can go deep enough to where you can line up the exit once you scrubbed off all the speed.