Where we have issues is where MAGISTERIUM OPPOSES MAGISTERIUM
You repeat this often and I thank you for that. For me, a light bulb moment and launch pad for follow up.
Once we agree that we can't set up an opposition between Tradition and Magisterium, then upon being confronted with apparent contradictions between pre-V2 Magisterium and post-V2 Magisterium, the issue then becomes whether we apply the hermeneutic of continuity or hermeneutic of rupture.
We have a strict obligation to TRY applying the hermeneutic of continuity as much as we possibly can. This hermeneutic of continuity must be the default for Catholics.
It's only as the LAST POSSIBLE RESORT when no such hermeneutic can conceivably be applied to discrepancies that we must say that there has been a rupture.
And what's funny is that I think the Vatican would perfectly agree with this line of thinking.