That surprises me. I've been to The Mile twice and have a total of 10 high speed passes there. I have no damage and my belly pans look like new. Of course there is always the possibility of rock damage so I recommend painters tape on your rocker panels and intake scoops, but that seems to be all that is needed.
Are you sure the pan damage wasn't done when your car spun off the track? The video shows lots of grass and dirt flying high in the air.
It could also be the extra 30 mph you had on me!:lol