How much do your wheels turn inside of your slicks?

I ran 10 pounds of air and used rim screws from the very beginning. One day I lost traction for no apparent reason. Back in the pit area, I noticed that the cords were showing through my M & H 10 inch X 27 or 28 slicks. Had to pack up and go home. Had Greyhound ship me out another pair that week. Had maybe 200 runs on the old tires. Ran tubes in them too.