Most vehicles cannot be aligned to within OEM spec after lowering > 1". This is normal. What you want to see on the alignment printout is that camber is near identical between fronts and rears independently. The more important factor for tire wear is 'toe'. Typically, as you lower a multi-link suspension, the geometry dictates that you gain more negative camber (desirable), but also gain 'toe in' (not desirable). Toe in (or out) to a degree larger than dictated by the OEM spec will wear tires like mofo. It basically shreds them.

My previous car had about -1.5 front camber and -2.5 rear camber, but with my aftermarket camber-adjusting kits, I was able to achieve 0 toe, which was excellent for tire wear.