Good to see threads like this - enough of the oil threads - let the grease wars begin!
I don't think that type of grease is available over here it has a lot of nice marketing attached to it as well as essentially saying it is the only grease you'll ever need to use - all purpose - one solution for everything solutions tend not to be as could as they say; but I don't know if that applies here.
Here's a PDF for the experts who like tech specs
http://www.pennzoil.com/wp-content/uploads/2012/02/Premium-Wheel-Bearing-707L.pdf
Do you think you might have over packed the grease in the bearings?
Did you clean them really well before using this stuff? Sometimes a mixture of different things isn't great.