As well as the settings bit, I would not over-power the car. A really fast car hides a multitude of driving sins as every straight is a chance to catch back time when you get the entry and exit right to the straight, but miss a few apexes in the infield.
I'd suggest a lower-powered car because line and speed, and carrying corner speed, show up more on the clock than with a fast car. Once you have that off pat, put the same car on a slippery surface and try again - that will teach car control. When you can do that with your eyes shut, up the power and try again. It's about gaining the mental capacity to work with the car, to make the time to see what is going on and be able to plan and adjust in a race.
Just my thoughts. Have fun whatever you choose to do.
