On a high traction carpet surface the CRC blacks won't glaze over and cause inconsistant traction. They stayed the same the entire run. The car was very balanced fron beginning to end. With some other tires, the car might be good of the first part of the run but would get loose later in the run.
I ran both types of tires in Cleveland. I tried 2 stage in the front (Pink and purple) and 2 stage rear tires. The car was very inconsistant. I then tried CRC Blacks in the front and 2 stage in the rear. This setup worked very well in both stock & 19 turn. The car stayed very balanced the entire run.