I doubt there's anything wrong with the hub yet. Threads don't really strip "just a little". That's like being a little pregnant.
What cog is on there? It's entirely possible that the cog isn't wide enough to properly seat against the lockring. Surly's were notorious for this back in the day. A Dura Ace or EAI cog aren't that much and are fine quality. Go DA if you can stay at 16t or smaller, EAI if you must go over. Know that there have been a few reports of EAI cogs cracking, but that seems to be relatively rare.