It's impossible to overpack bearings, the excess grease just squirts out the other side of the cage. Infact thats how you know they are packed properly and fully.

I am partial to synthetic grease, years ago I had a 280Z racekar that would eat front wheel bearings and spindles on a regular basis. After I tried synthetic the problem went away.

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Karl B
95 E300 D
2006 Mazdaspeed 6
2001 GMC Yukon XL
1997 Contour SVT
Mazda RX-7 SCCA race car