Nothing much wrong and rather a lot to go over but in general the x2 converter on the 400mm is pushing your luck as that will be over 800mm so the chances are reduced in getting sharp wildlife shots without a tripod and unless the light is great.. just use the 400mm on its own for a while..  Use 1 shot AF and focus on the eye use the manual over-ride on the focus to fine tune  

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt