I did put in another 15 minutes of qualifying for race C, and I stepped up my game by about 3 tenths! There's certainly more time to be found if I could be bothered to spend another 15 or 30 minutes of time trialing. I am most happy about the fact that I now in total spent maybe 40 minutes of qualifying this week, and I am about 2.2 % away from the world's top time. That would've cost me 2 hours of qualifying a year back, if I could reach it at all. Nice to see that I can set a reasonable time that quickly and then just have fun racing.
About that: did 2 more races today with that freshly set qualifying time (I headed into some trouble at work, with the upside I have some extra time for racing now). The first race I started P5 on the hard tire. Went into the pits quickly at the end of lap 1 to escape the close racing madness. I cut the inside so much that I ran into the pit barrier on the inside

But I kept my head down and did a nice recovery drive to a P4 finish.
Second race I started P8, in a lobby that was way quicker than the first race. (P1 a full second faster, most people behind me almost as fast as I was). So I didn't have any high hopes. During the twisty start of sector 3 in lap 1, someone punted me 3 times in close succession, causing me to lose control of the car and crash into the barrier sigh. So I made my pit stop and kept on driving. I saw more people than during all the other races have crashes so I could overtake them. Finished P7, so even higher than my starting position!
I think I could make this work by watching my tires. I was already doing this from the first race onwards, and I saw now that Luke made a video about it. If you just nurse your tires a bit, you can very easily do 10 laps on the mediums (at least in the Citroen) and still have decent tire life left to defend or attack at the end. I made up several places in the last 3 laps, and saw in the replay that many of my competitors had worse tires. Or they had the same tire state, but had to drive 4 or 5 laps on the hards in order to achieve this. So they lost time in that stint.