I dislike sending anything to Nikon, because of their user-hostile practices. But in this case, yes, I would send it to Nikon. This one is a pretty extensive repair, and a lot could be wrong with it, not just the things you've mentioned. I'd guess for example that you do have one or more elements decentered, and you really don't know yet whether or not the VR mechanism is fully up to scratch.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!