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I think a lot of these issues are caused by engine builders not SETTING ( or seating ) the thrust bearing properly during an engine build and correcting if needed the thrust bearing clearances. With more and more engines going together with NEW after market cranks and bearings made who knows where this area needs SPECIAL attention. 
I have to agree with this. generally speaking, It's not the experienced guys having these issues unless it's due to factors outside of the engine, but from what we see here, that's seldom the case.
Main caps cut crooked during a line hone/bore is a very common cause as is not setting the clearance properly during assembly and verifying it, especially when changing over to studded mains.
machine shop owner and engine builder
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