Thanks HTBWC for telling us of your method, and your new findings. I am always pleased to change my mind when proof emerges that an idea I held was wrong, though it is a shock sometimes !
I have had many such shocks since leaving the JW org well over a decade ago, so I am getting used to it. The fact that you are so willing to rewrite gives me confidence your book will be as accurate as possible, but things move with such speed, even in the seemingly dusty and arcane world of Biblical studies, that your book may need an addendum or two !.
Good luck with your work, I take it that like me you find Scholars that are more secular or Atheistic in their outlook to be far more credible than the Scholarly "believers" ?
It seems that many of these reliable Scholars do put the composition of the O.T as very late compared to earlier thinking, the other question is, who were these men that composed the O.T. in terms of Ethnicity, and Education and Religious influence ?