Bob, Kings and Chronicles are not in error with one another. The difference between them is the perspective from which they were written. I've seen all this before, and the presumption of error is in on the part of men, not God, nor the scriptures. One was written from the perspective from the temple, and the other from the palace. One from God's perspective, the other through men. Some wording is different, such as one pace where it says an evil sprit from the Lord, the other and angel from the Lord to torment Saul, if I recall that one correctly. J. Vernon McGee taught on this topic very well, and I think he handled it beautifully. Ezra, the man who put together those and all the other books of what we call the Old Testament, has a great respect for the word of God...enough to refrain from calling it into question.
If ever we're going to call something into question is can be translations. God, however, has stated His thoughts on this very well in 1 John 2:27. We have the written word of God, and best of all, we have Holy Spirit to reveal the deeper things of what we read and what He gives to us in that deeper relationship through prayer and meditation, and in quietness before Him.
Perhaps you define perfection differently than most others here, but the meaning within the scriptures, when not referring to the Lord Most High Himself, is "completeness." The word of God is complete, and without any need to for adding new revelation. The Lord has spoken to us through His only begotten Son, and through His apostles. Those today who claim to have some new revelation from God are suspect to say the least...some of whom claim and sing about how God is allegedly "...doing a new thing..."
Such men state that from their own authority, many of whom teach what is contrary to what is written. Some very popular men we have all seen on TV, seen their books, and can watch them on Youtube right now, have looked right into the camera and declared what turned out to be totally false prophecies, and their blind supporters continue to send them money. Many false prophets are among us, and rather than get angry at them, I knock the dust off my feet and move on (figuratively speaking). I don't fear them. They have their reward, and will stand before the Most High when the time comes.
MM