Not really. I was more talking about the high-speed test @ Nürburgring by AMuS two or three months ago. The CCX didn't even finish the first lap, it crashed right away! The driver said it had to struggle even in the straights to keep the car in line because each and every irregularity on the track's surface disturbed the car's rear stability.
The problem is not too much power for grip, it's too little downforce for power. That's why in a drag race you can't notice that.