I often have dificulty here too. Coming off the straight, I often brake enough to downshift once after the second slight left. Then I take that right and slam on the brakes entering that left with the extra pavement off to the left, ride high on the cobblestone and exit at the apex of the next corner. Of course, if somebody gets me mad on that straight, I skip brakes alltogether and run straight into the wall, spin and continue on my merry way. This is often faster.
As for that last corner, I start wide, and turn in early. I cut close to the wall and get carried to the outside of the cobblestones there. But you have to cut back fast because that pavement ends fast.
So, left, left, brake, downshift, right, gas, left, slam the brakes, right, gas, left, brake, right, gas. <- To follow my chain of actions better.