I even notice that 2010's driver side mirror has slight shaking too.
Funny how everyone is ignoring my solution. Oh well.
Have you tried putting heavy grease behind the glass?
The glass is very easy to take out and put back in.
Push outside inwards all the way. Slide glass out from inner side (carefully disconnect connectors while sliding it out).
Reverse the process putting it back in.
Send me a PM with a valid e-mail. I can send you a page from the WorkShop manual.
It is really not that tough to do.