Our Lady is not our Salvation. Our Lord is our Salvation. Our Lady intervenes for us and obtains Graces for us, but she cannot save us and is not our Salvation.
In as much as Christ has made St. Mary our Mediatrix of All Graces, she is our salvation. The translation I proposed is entirely apropos, and goes directly to the heart of what is meant by "Salve" and "Hail", which is not "Hello!", which is why the word "Ave" was not used.
"Through the prayers of the Mother of God, O Savior save us!" (Liturgy of St. John Chrysostom, First Antiphon)
"O most holy Mother of God, save us!" (Akathist Hymn)
"If anyone shall not confess the holy ever-virgin Mary, truly and properly the Mother of God, to be higher than every creature whether visible or invisible, and does not with sincere faith seek her intercessions as of one having confidence in her access to our God, since she bare him, let him be anathema." (Second Council of Nicaea, Canon 15)
“In as much as Christ has made St. Mary our Mediatrix of All Graces, she is our salvation.”
How can that which stands between us and our Salvation be our Salvation? I don’t see that your conclusion logically or theologically follows from your premise.
I note that two of your three quotations seem to undermine your position:
“Through the prayers of the Mother of God, O Savior save us!” (Liturgy of St. John Chrysostom, First Antiphon)
Surely the Saint is asking Our Lord to save him through the prayers of the Blessed Virgin, and not asking the Blessed Virgin to save him.
"…and does not with sincere faith seek her intercessions as of one having confidence in her access to our God…”
Yes, her intercession. She intercedes for us with Our Lord, who is our Salvation. I don’t see how that makes her our Salvation.