How long since last alignment? One good pothole can knock things off. Your assessment may be right. I wont pretend to be an expert, hopefully others will chime in. I'm having same issue to a much lesser extent. I've had 2 alignments in about a years time. Ea. time they've said the camber was just barely off. Nissan said it was so close to perfect they didn't want to touch it. They also said the uneven wear was do to my lift. I now get it done at a shop familiar with adjusting aftermarket control arms. So far it doesn't appear to be getting worse.