rough512
I would leave the car in the F configuration. It is probably the easiest car to drive since you have a lot of weight over the front wheels, it will have very responsive steering. Don't lose confidence about spending a lot of time against the boards. We all learned that way. Get comfortable with driving the track before you start making all kinds of changes. One of the most important things to learn in rc racing is how to control the throttle. Take it slow and easy and go wide in the turns when you have someone behind you. Your laptimes will always be faster when you are clean.
The part# for the F bumper is 53268. It should be around $15 and is a worthwhile investment. Good luck!