The old Chrysler method they used to tech at the drag seminars was to file the oil grooves bigger in the sides of the thrust bearing, following the natural taper already in them, but leaving the outside the same, just creating a bigger oil pocket. We did it on the hemi we raced for 14 yrs after loosing a bearing and crank , due probably from misalignment to start with, but that's another story, which is very important to do right.
