Just out of curiosity, have you ever thought about using a monopod? When I pull out my big lens for my D600 to do what you did, I find that I get much better results using one vs. doing it freestyle. Especially when I'm zooming in close. Just a thought!Yeah handholding a 70-210 f2.8 at slow shutter speeds really is not conducive to tack sharp photos.
Still learning the camera, the controls are very different from my Nikons and I have to buy a new flash because my SB700 does not work TTL.