Either I didn't explain very clearly or you don't understand my question.

Symmetrical means the spindle is equal length on both sides, therefore it makes no difference which way and there is no backwards way (though the instructions does say to install it with the "L" in Phil towards the drive side).

Nothing to do with tightening the cups either, as I stated in my post what was once a symmetrical spindle is now asymmetrical after a few months of usage. If the cups were not tight enough there would be side to side play or looseness, there isn't.

My assumption is that the press fit between the spindle and the bearing inner races must not be tight enough.
Has anyone experienced this before?