Wasn't there rubber tires at Cleveland back in the first years of TC? If I remember right, and that's a stretch at my age, the rubber tires screwed with the bite. Foam classes would run and the bite came up, only to have all the bite go away after the rubber tires were through. If you were in the early foam heats, you were screwed. Personal opinion is that there should be three classes of each scale, Mod, stock & Masters, and that's it. Or you could put rubber tires on the 12th scale cars too.
There were some years that guys like Skip Starkey would run 4-5-6 classes, but he's a stud. Most I could pull off were 4 max.