[Blue-S]

Although the rear negative camber will cause accelerated rear tire wear (inside edge) in street driving, I am more worried about the rear toe. One degreee of toe-in is a HUGE amount, and it is grossly outside the specifications. That toe setting will eat the outer edges of your tires very quickly. Do not leave it like that! If they have to re-adjust the rear camber to a more negative value in order to get the toe back in specification, they should do it. Your "before" readings indicate that should be feasible.

If you want to run the car with these springs on the street, you should consider investing in some of the aftermarket adjustible suspension links that will allow rear camber to be reduced while keeping rear toe at a reasonable value.