NHTSA Complaint #11428741 — 2021 KIA FORTE

Bought the KIA 4/192021 from Camelback KIA - Phoenix, AZ. Drove the car home to Green Valley. Approximately 2 months later checked the tires air pressure and discovered that 3 of the tires were at 52 PSI and 1 was at 51 PSI. After checking with a neighbor who owns 2 KIA Fortes with KUMHO tires about the PSI (which is the max PSI located on the sidewall) he said he thought that was wrong. I called Camelback to confirm if that was what they should be kept at - left a message. After 3 failed attempts getting a call back from Camelback and 3 contacts with KIA via their website (no return contacts). I finally contacted KUMHO who emailed me that I should follow the recommendations listed on the car door - 33PSI. My concern is are the tires now dangerous after nearly 3000 miles at 51 - 52 PSI? I have been told that driving with the tires at that max PSI causes excessive wear in the center especially in the Arizona heat. Neither Camelback or KIA has ever contacted me - 6 total attempts. Tires are 225/45 R17 Kumho Majesty Solus.