I am/have been frustrated with the buzz myself. If I take a trip on the connie, I feel it in my hands for a few days after. That said, the concours is the perfect bike for me at the moment, and I have no interest in giving it up.
On my old 86, I did nothing to try and subdue the buzz. I just lived with it. Now, when I got rid of the 86 and now have an 06, I was determined to make a dent in it. I have not yet done so. Lol. I have done all the steps outlined but all the forum posts, with the exception of the carb service/sync. I did have a significant gap in my upper left motor mount (forum posts said to do that last). So I shimmed it with some washers, and had the everything torqued correctly. Also adjusted the balancer, no change. So do what's best for you. If I am going on longer trips, I'll put a set of those foam grips over murphs grips to cut it down a little bit.