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I think everyone is overlooking a major potential source of the failure:
Especially given that the seal is so hard to install without damaging it to begin with, it seems very possible that a percentage of the seals have damage coming from the factory.
Of course by the time the engine fails it is probably destroyed, and/or shot out the exhaust valves, so the root cause is unobservable. This coupled with the fact that a tiny tear would spread under engine conditions would mean they would need to do something drastic to check a lot of injectors on the factory floor to determine this. By a lot I mean an entire shipment, not the usual sigma six requirements, and by drastic, maybe xray, or a microscope.
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