You seem to have an extremely good grasp of all that Andrew. These two definitions may be helpful:
Monolatry, literally, worship of one god alone. As a modified form of polytheism, the texts of scripture bear witness to monolatry, meaning “Plenty of gods exist, but you are to worship only one of them.” This is also indicated in the first Commandment.
Henotheism , effectively synonymous with “monolatry”– attention to a single god. Also as Indicated in the first Commandment, which takes for granted the existence of other gods.
I believe in Hebrew El-Shaddai means the godess with breasts. Have you read Margaret Barker’s “Temple Theology” ?