Just got the same issue with my 05 mdx,I went to balance the tires on a place that only does tires, they balance them 3 times(only pay for the first one), and still vibrating, I call the dealer and they told is balancing, so I did not want to keep on trying at the same place, so I look on the web for similar issues and find out that I need it to take it to balance to a place that uses a machine call the road hunter GSP700, luckly me my regular mechanic has one of them, so I took it there, and after $70 dollars, problem solved.
He mentioned that some luxury cars need a more precise balancing.
I have not got a issue with wheel vibration since then, all this happen after I put new tires at the place that try to balance the tires. they did a good job with the tires, but the equipment that they have, is not as new as the road hunter.