I can't offer too much. One thing I do know is that sodium levels do not have much to do with your actual sodium consumption. It has more to do with the strength of your adrenal glands, as well as your level of stress.
People with very weak adrenals will have low sodium in their hair even if they drink salt water all day.
So you seem to have a lot more adrenal strength now.
That is about the limits of my knowledge. You should have access to talk to someone with your hair analysis. Someone with more experience should be able to give you more information.