It can be extended past 10K--you still have 3.84 TBN with some shearing (but not too bad and no telling when it happened--early or late in the OCI). I would go 12-14K and test once more. I believe you will find that you can go 15K per OCI which is 50% longer than you planned so it saves you $$$ in the long run.
I will assume the sodium is a remnant from a previous oil that used sodium in its additive pack?