If injecting grease into the hub is a normal part of Nexus servicing then you're likely just feeling the grease drag. It should go away in a few days as riding and shifting moves the excess into the nooks and crannies of the hub. Also as you mention it's been darned cold and rather "Ontario like" around these parts the last week. And cold grease doesn't move quickly for any man or woman...
So if you want to compare to see if things are getting better after a couple of rides be sure you do all your testing with the hub at the same temperature. If it was room temp when you tried it the first time then be sure to let the bike warm to room temp fully before you test it after riding.