Michelin Pro 3 Issue?

[Chief]

I have been using Pro 3 tires since shortly after they came out. The center tread, which typically is colored, is about 15 mm wide. I have noticed that checking/cracking has occurred in either region between the edge of this tread and the sidewall on both the front and rear tires. The front tire has perhaps twice the miles on it than the rear tire. On the front tire I noticed that cracking at one edge of the center tread has extended to where you can see the casing of the tire. It appears that the center treads on both tires may be a couple of millimeters off center in places and that the checking/cracking occurs in this wider exposed region; i.e., it appears that more than the center tread may be meeting the road and is causing the damage. Has anyone else had issues with the Pro 3's? I typically run the front tire at 105 psi and rear tire at 110 psi. I weigh about 165 lbs.