60D Back Button Focus - AI Servo vs. One Shot - missed focus in AI Servo

Since upgrading from my Rebel XT (350D) to a 60D, I've switched to "Back Button" autofocus and leave the focus mode in AI Servo. I figured that it would be the best of both worlds - it can act like One Shot for focus and recompose by taking my thumb off of the button before recomposing, but then it's always ready and in "AI Servo" mode when I want to track the kids running around.
However, in low light I've noticed that sometimes it misses focus. It seems to think that it's focused correctly, as ...

Source: DP CANON EOS 7D/50D-10D FORUM visit source for complete content

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