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Synthetic grease can get liquidy from being used with dino sometimes. My experience is that the dino liquifies the synth wherever they come in contact. So it's important to thoroughly clean any trace of dino out of the bearings if you switch to synthetic. I use brake cleaner spray liberally on everything, until the surfaces and bearings are bone-dry, and I inspect the bearings very carefully for any hidden deposits of dino grease. The stuff is good at hiding on the ends of the rollers and inside the creases of the carriers.

The runny grease you're desribing sure sounds like that's what happened. If you overpacked (sounds like you did), that would have forced the thin stuff right through your seals. Kind of like making a drink in the blender with a loose lid...&^)

You shouldn't need a second seal back there if the spindle is good and the grease stays thick.