A couple of months ago I bought a leftover new 2013 Super Tenere. The bike had the suspect vibration right from the beginning; it wasn't something that needed time to develop. Today, I had the 2014 clutch basket installed, and the vibration is gone. I had a little over 2,000 miles on it when the clutch basket was swapped out. The difference is very obvious. I'm relieved I didn't waste my money/time on the wrong fix!
Also, before I bought the 2014 clutch basket, I asked the dealer to try to get Yamaha to cover it under warranty. The service manager never had this situation come up and got back to me the next day after getting the chance to contact the rep. He said that Yamaha would only replace the clutch basket under warranty if it failed. And, if it failed, they would replace it with the same type of clutch basket, not the updated clutch basket. I never expected Yamaha to cover it under warranty, but I figured no harm in asking just in case I got lucky. However, I'm surprised that if there was a warranty issue, that they would still use the older clutch basket.
Anyway, long story short, the 2014 clutch basket fixed the problem for me!