Seems like the camber wasn't the real issue in the wearing of the tyres then as 2.5 degrees isn't that serious. I wouldn't have gone as far back as 0.5 though. As GTSBoy said, around 1 degree would have been better.
Also 30psi is pretty low and so is 34. You need to run at least 36 if not 38 psi.
Superpro make great quality bushes and are just as good as whiteline.