Sorry I don’t know the answer, but over the years have seen many a P/S pump not lined up on a SBM. I’ve had several the same way and the only issues I ever had was for the belt to make some noise while revving in neutral due to the fan.
Botton line is I don’t believe the small amount of possible misalignment is the issue and most likely it’s the fan pulley that is slipping.
I recently converted to a serpentine setup to cure the belt issue with the A/C but even with that I had to make some modifications to the spacing to get things lined up correctly.
