Hmmm... I've never noticed that I break more parts with foams then with rubber, so I'd bet that just coincidence. Could be that since you have more grip, you're over cooking turns and getting into more trouble. You didn't say what class you're running, but if you're running sedan or pro-10 make sure the body never comes into contact with the tires. I usually push the body in, sort of simulating various types of hits, to make sure that the body never touches any of the tires. If it does, it will cause the car to push and can cut the tire as well. Get in the habit of looking 4 or 5 car lengths ahead of your car instead of look at your car. That will help you avoid trouble too. Good luck!