I'm like your new post processing style, however I am not a fan of the pictures which only include part of a car or are poorly composed. Images like your preview image for part 3, doesn't work for me. Your main focus in that picture is presumably the Lacetti, but the Airwaves BMW is blocking the front part, and honestly if I'd taken it I'd probably have binned it. Going back to Update Part 2, the driver shot (walking along the barrier) is although a nice idea and composed well, out of focus. Whether this is due to cropping or just generally being OOF I don't know.
To make this post not completely negative, the rest of set for Part 3 is pretty good excluding the shots were not all the car are in or poorly composed. I'm especially liking the final image of the cars going round the chicane. Hopefully, you'll take my criticism on board and improve for next time. 👍