Those 4" cones shouldn't get wedged under your car so much as the big ones. That and they're harder to hit to get them flying through the air. Maybe you should swap out all the cones at the next autocross.
I was going to petetion the SCCA to use smaller cones, so I would not get so much Cone "skin" all over my car when I hit them head on. I hit so many cones that I am going to have to buff out the front of my car this weekend and then re-wax it.
From now on I am running events with my front end cover on! :lol: