As far as I know, there is no completely automatic, good, thorough and safe way to do what you want.
Besides a completely manual correction process, the only other means of getting things corrected is by using the Find Duplicates plugin to group similar authors/titles and make your corrections there. This might not result in capturing all books (it might miss a drastically renamed book) and therefore will not result in 100% accuracy. But it probably is your best shot.
Something to keep in mind... As I understand things, the more recent Kindles have a tendency to rename books automatically to match their Amazon ID -- but only if an ID# is supplied -- without user intervention. (Based on a message thread several months old now, not sure if this functionality has been changed.) I mention this, not knowing if you're aware of it.
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