The balancing I had a few days ago was done in the manner you described.
As I was driving to work this morning, I remembered that this car has very sensitive balancing requirements - more so at high speed. I got it eradicated once, and now I suspect perhaps the balancing wasn't done on spot.
I might just leave it for the time being as it only irks me when I'm doing way above the legal limit, which I shouldn't be allowed this little simple luxury.
I should drive at 110 km/p and just watch the roads SLOWLY and QUIETLY rolling by without much fuss.
Thats the problem when driving a silent, but capably fast machine. More so when its done in absolute comfort.
ps. I will still check on the shaft to be doubly sure.