Doug,
Simple, but, spot on.
If the lens had a backfocus issue, it would typically show up in each image.
Judging by the sharpness in the final image, I'd say you just need to switch your AF point to the central focus point (typically the strongest performing point) and use the focus and recompose technique. Be careful when using shallow depths of field as the focus and recompose technique may not work for gross movements.
H
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