I have read most of this thread and don't think I missed it but if I did apologies. When discussing the trinity doctrine with people as an academic exercise, especially JW's, my question was always well what about the Holy Spirit? It seems most of the wrangling always involves Jesus and his nature with respect to God and so forth.
The Holy Spirit is if I remember my JW teaching correctly God's active spirit. It is a part of God, emanates from God yet has the hallmarks of personhood, independent action, emotion, appearance in a different form, etc. I would ask, well, it appears that you have no trouble with 2/3 of the trinity concept, why would it be such a leap to see Jesus in the same fashion? I never really saw that much difference between the two.