with -2 degrees camber be sure to adjust your toe to zero; Point the wheels straight ahead. I run about 1.8- chamber on the front with zero toe and my tire wear I would consider as normal. I run Michelin summer tires on the fronts and they have a little over 15,000 miles and still plenty of tread.
On the rear it is close to specs with about 1.3 degrees - chamber and a slight amount of toe in. Each car is a little different; give it a try.