[Dave in MN]

IMO: The nuts should be pretty snug against the sleeves and then tightened so the cotter pin can be slipped into the next opening in the crown nut. If these bolts are left loose, the lower portion of the socket can move forward and back as the radius ball puts pressure against the components. I think much of the "wallowed" condition of the bellhousings and bolts we find in our cars is from leaving the nuts too loose.
If the cotter pin hole is beyond the slot in the nut when tightened, add a washer(s) to the assembly that spaces the nut away from the sleeve. So...washer goes between the nut and the sleeve.

When the nuts are tightened against the sleeves, the correct size spring will still have and allow some movement of the bottom socket/plate.
Good Day!