Tamron PZD 18-270 issue using Vibration Compensation

I have copied the picture in Picassa for easier access. https://picasaweb.google.com/104313401146253955453/TestsTamron18270PZD?authuser=0&feat=directlink

I have been careful to let the VC stabilize before shooting, so I don't believe in the arguments above.

I paid attention that I don't get that issue when using the Q quiet mode.

It much less happens on the D3100 of a friend.

I believe the issue comes from a timing when the mirror returns.

Am I the only one having such issue with D7000 + Tamron PZD 18-270?