Yes, Jesus did grow in His understanding of Himself and His relationship with the Father while here on earth as a man; but in His pre-existence as the eternal Word of God He was fully equal and in perfect relationship with the Father, I think.
I agree with you on nearly every, and all other points, thank you for the discussion, but I just wanted address this one, not that I disagree with it though... I'll explain...
Just about his "pre-existence" I believe that he was fully equal and even one and the same in every way with the Father "before" creation, but that, at the point of creation and stepping, (I guess you could say "down" into it), (to be a part of it with us), was the "beginning" of his becoming, in some ways, more limited, or just slightly less than, God the Father...
That he "gave up" some things to "step down into" and be and become a part of creation with us... As our God in the OT... Then eventually to becoming a man for us and with us as Jesus Christ, then lowering himself, even further and submitting even to the point of death and dying on a cross... Then, after dying and being resurrected, became "all that he was before creation began" with the Father (once) again...
(John 17:5)- "And now, O Father, glorify thou me with thine own self with the
glory which I had with thee before the world (or universe, or creation) was (or began).
However "all" of John 17 applies here also... John 17, the entire chapter, talks all about it very well...
That he (Jesus) was YHWH... And that the beginning of him not being as great as the Father (in every single exact same way) (though he was "before creation") (John 17:5), he was not "after creation" and becoming a part with that creation with us, as our God... And he was not "again", until after the crucifixion and being resurrected, the he was (once) (again)...
I think this is also proven by simple logic, with and by examining YHWH, that "this" is "so", also... And, how he can't be the God spoken about in the OP... not in "all and every way" or the; or in being, the "exact same" or in every "equal way" anyway (cause they were "the same") (just not "always "completely equal to each other" in every way"), (mainly omniscience)... Anyway, he (YHWH) could not have been "always, always equal to", or as him, (The Father) (the God talked about in the OP) "in every way", anyway, not always...
Not without being "deceptive" or "pretending or acting", which I do not even consider a possibility, cause that would or might imply "lying" also... Or "pretending not to know" some things while he really did, or "whatever"...
It just not possible for YHWH to be the God being talked about in the OP... not the one, or the member of God at the "head" of the trinune YHWH or Godhead anyway... Not in the OT anyway... It/he had to be God the Son, or Jesus, for there is just no other way, or any other answer other than that... Though the Father was always with him, and was always "one" with him (YHWH, the Son) he (the Father) just couldn't have been the one at the head of God, or the Godhead, in the OT... It just had to be Jesus...
I've tried explaining this a bunch of times... But it's as if people are not understanding it or me, or what I mean by this... It's "not easy to say", so, I know it's "not easy to hear" for some, also, let alone "accept"... but I tell you, it is the truth...
I hope some get this, cause it really is "key" to "knowing our God"...
God Bless!