I'm not so sure that the material is the problem.  Look at the wear pattern and you'll see that the tip of the teeth are worn and a matching spot on the adjacent tooth is worn where the tip of the mating gear tooth contacted.  The tooth profile is clearly wrong and doesn't match the one on the mating gear.  Who knows, now that it's mashed itself into compliance it may last forever as I don't see any evidence of galling.  A gear designer told me once gears wear themselves in they never wear out.  I wouldn't count on that happening in this case, but I don't think a material change will fix this.  Are all gears from this supplier wrong?  I would worry if I had one in my engine.

Gary Casey