FYI, this is a decent link on the ratings of Diesel by brand (see bottom of post)
I'm no diesel expert, but I'm not sure how much the cetane rating really has to do with injector failures. It would seem to me that if we were rating cleanliness, lubricity, and cetane of fuel as possible causes for injector failures, cetane would be number three out of the options. That said, it never hurts to address any/all possible causes.
I suspect that one thing we can do to help is keep your dealer on top of the fuel filter changes. They don't seem to be the best at remembering to fulfill their service obligations in the 50k mi service package outside of those specifically reminded by the onboard computers service recommendations.