....I've been in contact with a few C&C hubs recently, some mine, some other people's and there's a bit of a common theme appearing.
So the Top Tip is
"Even (Especially in fact!) if they are BRAND NEW, whip them apart and get a decent amount of good thick grease inside, then adjust them up properly. and do it NOW!!!"
I've seen a brand new hub lock up and the bike carried back to the car.
A new set of my own had a rather loose locknut.
There's never enough grease in them.
They are generally adjusted too tight.
Apart from the first 2 points (Which are obvious) the reason I believe this is a Good Idea is that, by heck, doing this makes the hubs last forever.
I've been doing it for years and my C&C hubs last ald last and last. I recently pulled a 4 year old Deore rear apart that I'd done this to (It's been done once or twice since) and it was like new. And I just sold a bike (Roadrat commuter) with some even more basic Shimano hubs on it with virtually no sealing, the rear was better than new after 1300 miles. Glassy smooth.
Adjust and grease from NEW and they last FOREVER.
(P.S. - I don't use that crap white bike grease either. I 'borrowed' a grease cartrige from work. It's really thick sticky red Total stuff we use by the shedload for bushings on excavator buckets.)
Just do it. You'll thank me in 3 or 4 years time! :o)