Continued:
As for grease chemistry.
Certain greases are not compatible with one another. When mixed, they can become liquid like, and will loose their viscosity.
The AFT PDS seal.
This seal installs in the non-conventional direction.... I.E., with the lip and tension spring visible from AFT.
Excessive grease will pass around/through the lip and will simply puke out.
(this is not a water seal.... it's there to hold grease against the open bearing, but not under pressure. excessive amounts will pass through it)
If the seal was installed incorrectly, you can drill a small hole in the seal body.
The FWD PDS seal!
It is imperative that the FWD PDS seal be either glued or staked in place.
If this seal was to be pushed out of position (by excessive grease), no future grease will make it through the AFT bearing.