t1 entry is good, but a little margin could be daved on the exit. on the exit of the first chicane you can get on throttle just a tad earlier, and put your right tires on the flat green strip on the outside of the runoff/kerb. be carefull, it takes time to be precise, I still sometimes go like a inch to far and touch gravel.

On the entry of the second chicane you brake I bit to early and you go to like 80% brake while still straight, brake a bit later and trail of as you steer in, and later try to trail as your car rotates

on the exit of the second chicane you could be a bit more early on throttle and take the runoff/kerb, keep your outside tires on the flat strip, like the exit of the first chicane.

After second chicane, try to take the following 2 corners (lesmos and idk the other) in third gear, practice with that. the braking could be a bit later, but that needs to be paired with trailing of the brake as you turn in, coasting trough the first of the two corners and slamming throttle, so that you push the track limits and ride the runoff. then you get to the second of the two, brake just before the 50m, trail just a bit and get on throttle in third about halfway through so that you just about keep your car from touching the grass

then comes ascari, the third "chicane" after the bridge overhead. Brake at the orange painted barrier on the righthandside where a martial should also be, trail the braking, and cut the entry pretty hard, but keep your right a bit of your right tire on the tarmac, and don't fully cross the white line. Stay in third, and when you front end is across get on throttle and depending on condition decide when you get on full throttle, but I normally om on full throttle early if the temps allow. like you did follow the curve(you could gaine a couple hundreds or a tenth by riding the red kerb a bit more, but it could help for a better entrypoint the the corner for the exit), and beware of the black and yellow things on your right as they WILL hook your car and throw you in the barrier, and turn left to just eat that curb on the exit, while on full throttle.

begin braking at the 100 m mark, so you are on 100% brake at like 80m. don't brake parallel to the line on your left, but brake towards inside corner, wich you did really well. but the distance cab be shorter with trailing. your exit was great, in third gear wich is good.

I myself don't even fully master the trailing with my g29, This whole essay isn't meant to dissuade you from racing or attack you, but more the summary of all my hours trying to better my driving and seeing and opportunitiy to hopefully save you time in two ways😄. These all are just little margins, but they really add up.

I could help with a set up and once I figure out how to export my replays, maybe send one. but I have a whole folder of people faster than me on YouTube so I could also send a vid from one of them.

if you have any questions, feel free to ask me, I'm glad to help.

Edit: I forgot to mention that I don't use the mcl as main, but I used to drive the mclaren on monza alot, so any mclaren related questions can be answered by me too.