Oh this was an old thread. Bah.
So, goodguy, what were you doing wrong?
I guess its a combination of few things that all lead to the total improvement and satisfaction I have now with this wonderful lens.
I will use slightly faster minimum shutter speed.
I use a different technique when I shoot so I am less susceptible to camera shake
I press slower on shutter botton which used to make me shake camera
Slow down and think before I shoot, just see better what I shoot.
Its just many little things and I cant say one big thing changed it.
I think in general the better the lens is the less forgiving it is and with such a relative big heavy lens compared to the one I had bfroe (24-85mm VR) and lack of VR I needed to tweak my skills to let the lens really shine.