ok, i have those centered pf bushings as well and installed them with ease.
You just need to be careful and precise at the point where the carrier bolts rest, and dont slide the bushing too far.
I didn't use soap and water on the control arm like most people do. however i did use the washer with a clamp behind it for a peace of mind in case the black piece slides out.
Six months so far and mine haven't moved a mm. They are solid.