First born of all creation does not say first created of all created. Jesus was YHWAH begotten son. Not too sure I want to explain that one but the WORD and YHWH had a unique relationship, "Let us create." I doubt YHWH was talking with his angels. Two God's having a great time creating with their angels.
Anyhow, I keep it simple Jesus was the Word in the beginning prior to creation.The Word was in Eternity with YHWH. Eternity is a topic the WT seems to neglect it was before star,sun,and moon that make up 24 hours in a day.
I believe Jesus is God but not the Heavenly Father God. If YHWH can call Jesus God who am I to argue with him or her!
Yogasana thank you for sharing your research!