The lower punch levels will make the car start more gently.

The hobbywing justock combo comes with a motor with fixed timing on the motor. In stock racing for offroad, timing is not allowed to be set on the ESC . but timing adjustments can be made on the motor. Once you get used to running what you've got, if you're noticing a lack of speed then get a motor that has adjustable timing on the motor can. Motors labeled 'SPEC' are usually fixed timing.

For racing, it is better to disable reverse and just use the Forward/Brake Option. If you do have reverse setup for practicing, don't use it during a race.