First time I re-greased my hubs I used white lithium grease. Few weeks later I noticed my wheels turning slower when spun freely. At first I thought I tightened the cones too much, but messing around with it showed me that it wasn't the case. I opened the hubs and it turned out that the grease almost turned into a glue-like, kind of sludgy sugar-like substance.
WLG is definitely not made for bearings of any kind that require much action. Maybe it's good for door hinges.