It's definitely NOT overinflation. I run 32psi on my staggered 19" and have the same issue with the Michelin Latitude. I didn't have any problem on my previous Bridgestone Turanza or Pirelli Scorpion, even when I was running at 35-36psi. It's most likely a problem with Michelin I'm going back to Pirelli and will plan on keeping it at around 32-33psi this time. I'll keep an eye on it to see how it'll wear.