When you tighten a lock ring (if possible) a lubed case should be in the shell holder and the die should be making hard contact with the shell holder (cam over) and then tighten the lock ring down when it is centered in the threads of the press.
If you just lower the die to the height you want it and tighten the lock ring this can cause the die to tilt in the course threads of the press.
With a case in the shell holder and the case inside the die centering it and with the shell holder pushing up on the die, the die will then be centered in the press, and you will load more concentric and accurate ammo.
I have a 1973 dated Rockchucker press and this is how you eliminated slop and misalignment with your dies. I also use Redding competition shell holders to control shoulder bump.
I know we are talking handgun/pistol dies but remember Lee put the o-ring on the lock ring for a reason and that is to allow the die to float and self center in the press.
If you need to have clearance between the shell holder and die then use feeler gauges, spacers,etc and still raise the ram, push on the die centering the die in the press and then tighten and lock the lockring.