One other point that should be helpful and I am surprised no one mentioned it. Your AF settings were on AF-A and AF-S. Especially when shooting small targets allowing the camera to pick the AF points is far from ideal. I would suggest you try AF-C single point, even though the targets are tough because of there size or color I believe that you will have much better results. 21 pt dynamic will allow the camera far too much latitude in choosing what it thinks you are trying to focus on. AF-S will not allow for any movement at all, once the focus is selected it will not adjust at all if there is any movement. Even if the camera nails focus as everyone has said here there are just no enough pixels to provide much detail in such a small portion of the frame. Good luck.
Marc There are always two people in every picture: the photographer and the viewer.-Ansel Adams