According St. Vincent, antiquity trumps universality and consent, unless there is a sign of disagreement within antiquity itself.
This is my whole point which you seem to constantly ignore, the universal testimony of the Latin Fathers shows that the use of Filioque in the West was the status quo and shows at least that there was disagreement within antiquity. I would go further, however, and maintain that because of differences in language the Greek formulation just did not address what the Latin Fathers were trying to say.
Not until Augustine of Hippo was there ANYONE among the Latin fathers who taught or even suggested the filioque heresy. It is therefore a novelty and thus heresy, if only because of that. This too was been covered with great thoroughness by St. Mark of Ephesus at the Council of Florence. The Latin bishops there had no reponse to make other than scholastic proofs as opposed to patristic evidence. Don't take my word for it. Read Ostroumoff's history of the council.