I won both S-7 and 10 with my own Mines, it's not to difficult if you overtake without much hesitation. Also worth noting I was using pro and driving cleanly, I even picked up a shortcut penalty on S-10 after an Amuse refused to give up it's line and I didn't want to punt them off.
Are you kidding me? Those AI cars are unpuntable. They have magic tire adhesion. You can move them around but they NEVER spin.
Weebles wobble, but they don't fall down!
Regardless it's good practice to do my very best not to hit anything, my racing morales say there's a car there, don't hit it .