Wheel Bearings coming loose

As I've said before, the parts were correct matched set of bearings and races, races seated, followed FSM to the letter, proper seal. Others on the C body site said to preload the bearings (never needed to before) by tightening the nut til the wheel is hard to turn by hand and back off then tightening to spec. I held off on that route since it sounds suspect to me.

I did take the hub apart completely and replaced the races and bearings and seal. Cleaned out the old grease and put in some new red stuff. Got new spindle nuts and that didn't do anything. The spindles don't have any damage to them.

I am using my head, and scratching it at the same time. I know there isn't a lot to it, but replacing should have solved the problem. I'll just tear it apart again and inspect/rebuild. Out to the garage I go.

Scott