" however the writings reflect a far more sophisticated and esoteric conception of deity than the WT insists ".
That is my perception too, it makes me wonder if that sophisticated way of thinking of Deity came from Babylon, it seems not to be there in earlier thought or writings, but unravelling when particular ideas were perhaps written back in to Scripture is a constant struggle.
In the first century BCE, the Greek historian Diodorus of Sicily praised the Babylonians for their devotion to philosophy. But that thinking may have come from further East, I would imagine these ideas were totally new to the Israelite Elite exiled in Babylon, but they embraced them with alacrity and zeal.
It is a new thought to me that the so-called "Hellenization" of Jewish Religious thought occurred most likely in Babylon, and they therefore had adopted such ideas before the Greek philosophers like Plato.
It all adds to the argument that the development and adoption of the Trinity Doctrine is firmly based upon religious thought we find in the whole of the Bible, and is not some upstart doctrine to be rejected out of hand as the W.T, and others do.
The old canard that the O.T was written by "Bronze Age goat herders" looks even more silly now !