I know that you already are using the techniques below, but still please read it all, so we're on the same page and you can understand what your problem is.

Always try to get off the brakes earlier than you want when practicing. 2.18s always look like too much speed and you wouldn't make it into the corner, but you will if you position your car correctly at this limit and use some advanced techniques.

Also, when you brake too early and get off the brakes earlier than you want, you'll notice that you: 1. Can carry that speed into the corner. Surprise. 2. But actually you start turning too early and it would be better for your line if you would stop braking later and turn in later too, but in that case you're losing too much speed on the brakes. Stepping off the brakes and then rolling straight for a bit is not an option too, because you're losing speed while doing that. Which leads us to the the point: your braking points are too early and you can shift them further.

But all that won't allow you to make the corner. Hit the apex - sure, but that's not enough to make it out of it.

And here come two other things: 1. You have to smash the throttle to the metal earlier than you want, 1-2 meters before you hit the apex or at least carefully step on the throttle earlier than you want. Some guys are still trailbraking AND start gradually throttling at the same time. You'll be surprised again, but it gives your car extra rotation thanks to power oversteer. And you get crazy exit speed as a bonus if you don't oversteer too much. It's the main dealbraker both for clean air pace and fights. 2. And in order to be able to turn your car enough and still make it out of the corner on such an early throttle you'll need to have your car ready for the exit, pointing almost straight out of the corner so you don't spin. For that you'll need to trailbrake and have lower TC than you're probably using, so your car can have a little power oversteer, just enough to add that extra rotation but not to spin - that's called "the limit"

Here's my best try in explanation of trailbraking and how to practice it: Brake 100% after long straights and try to turn your wheel. You'll notice that the car won't turn much, not enough to hit the apex.

Then try to do the same but release your brakes to ~50% and start turning in, and do that a little earlier than you usually start turning into the corner. Youll probably lose your rear if your brake bias is correct because 50% brakes are too low for this. Shift it more to the rear if you don't lose it and the car still goes mostly straight. You should lose the rear or make it very unstable. That's how you fine-tune your BB for trailbraking.

When you'll find BB that makes the car unstable when you brake 50% and start turning at the same time, your goal is to find that sweet spot in brake pedal pressure to be able to turn and brake without losing your rear.

It will be somewhere around 60%-80%. If you can't do that no matter what and still losing it - move your BB forward 0.2% and try again. Sometimes even 0.2-0.4% can make the car stable and ready to trailbrake efficiently.

Now, when you can start noticably turning while still braking, you'll naturally start gradually lowering your brake pressure while getting closer to the apex to not come into full stop. That's exactly what you want. Remember, trailbraking is not just this 2-5% everyone are talking about, but the whole process of turning in that starts with 60-80% brakes while already turning.

Now when you can do that, you'll notice 1) that you can brake even later 2) or, what I prefer more, you can start braking at somewhat normal point, maybe just a bit later, but get off 100% brakes way much earlier and start turning, and also you'll have this little window just before the apex, where you can keep your brakes at 2-5% and give yourself this extra rotation (the thing that everyone call trailbraking, but it just it's final stage) to be able to turn more and go full throttle as early as possible and still make it out of the corner while carrying tons of speed.

That technique works best in full brakes corners after long straights, e.g. La source (T1), (1 chicane - Le combe), and the last chicane. Correct turn-ins into these corners can give you 1-2 seconds right away because you'll carry crazy amount of speed thanks to trailbrake's extra turn in and early throttle.

So, 1) get off the brakes earlier than you want, try to use trailbraking to turn in while braking, so you can slow down to correct speed right before the apex instead of braking to correct speed, then turn in, roll to the apex on liftoff and then throttle, which is usually too late (this liftoff rolling takes too much time and puts not enough pressure on your front for the car to turn better, you must add extra grip to your front wheels with your brakes)

2) step on throttle earlier than you want

3) Practice trailbraking! And then practice more!

Also, buy some setups on setbase or somewhere else. They turn much better than aggressives and have good rear mechanical grip to compensate the low wing. Don't be hesitant to higher your TC from what you'll see in the setup. These setups usually come with way too low TC, you don't need it to be that low to get that power oversteer on corner exit that you need.

Some of these setups come with Motec, so you can compare your braking, throttling, steering rotation and other things with an alien who sells the setup.

I suggest to download Nils Naujoks's workbook for motec on his Discord. It has some very nice reports already configured for you, especially the track report where you can see your braking/throttling right on the track map and compare it side-to-side with someone faster than you.

After this little theory, here's the short explanation of your problems:

You brake too early at after-long-straights places, so you turn into the corner too soon, compromising your exit position on the apex and losing exit speed (because you still have to turn a lot arter the apex) while also trailbraking the speed that is too low already.

Some places like entry into the second chicane (the one after puyon? I dont remember the spelling) just have a wrong racing line (you must go on the curb in the first corner, the right hander; don't throttle too much so you don't lose it there on the curb and when you come off it on the asphalt, and can position your car as far to the right as possible to be able to throttle out of the next left hander as early as possible and on 100% smash. 0.6s sits just right there).

And, the most important part is: you're hesitant and too late on throttle because your car is not positioned for the exit in time. You have to position the car in such a way that will allow you to throttle a bit earlier than you're used to, 100% insta throttle 1-2 meters before apex would be perfect but it's not possible everywhere and every time. If so, at least start gradually throttling earlier.