Difficult cars: Don't shy away from cars that are difficult to handle. If you are able to be on pace with a 9F or a Dominator for example, you are pretty much comfortable with any car and can focus more on opponents instead of keeping your own car on the road. smithy has made a video with some suggestions. Yes, it takes a bit longer to get used to these cars, but it's worth it, if you want to improve.
missing the video there "video with some suggestions."