Is the wear pattern tapered to one side of the rod? Its hard to tell from the picture, but the fatigued section of the bearing looks like it is closer to the camera. I would check the crank journal for taper, and the check to see if the connecting rods are still straight.
I was told a softer bearing material has better embedabilty. It can trap small peices of dirt. I had an old Vandervall bearing catalog that had a very good technical article on bearings, but I couldnt find it.
How round are the big end housing bores after those 10k runs?