@slthree What
@Stotty said, both here and in his lap guide earlier, should see you through. For the view of someone closer to your times (I think I did 1.57... in that dry test, but only after many attempts), maybe brake around 175m (so between the 200m and 150m boards) for the first chicane, just so you have more control going in and especially going out. You can always go slightly deeper as you get more comfortable. Second chicane 150m or just before is fine; the first kerb there is a bit more forgiving and it feels a bit more open to me. Rest per Stotty's advice. For the final chicane after the back straight I use the bridge as a marker, but brake just slightly before it; you can (carefully) trail into the first left, just be careful with inputs, as it is (for the likes of me) easy to oversteer. To play it safe, do all your braking in a straight line to get more control and a good exit.
I found I could use exactly the same brake markers in the wet, maybe because they are a bit conservative. Forget it is wet, just make more of an effort to stay clear of most kerbs, and you'll be fine. In the dry I was only about 0.5s in front of second; in the wet I was 3.5s in front.
And no adjustments to the car, other than the steering lock; 620 for the Lamborghini.
Yes, I think my brake marker for turn 1 is just before the 150.
Finally, I may be wrong, but I don't think you have to be first in all of these sessions, so don't be put off by these crazy quick times others are doing. If you are not first, I think you just get a lower rating, fewer cars to choose from for the first part of your career, and an 'easy' setting.