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Also before modernity receptio and consuetudo was the norm and standard, and the places that didn't receive a directive or had their consuetudo override it certainly weren't living in sin.

So your distinction between the Pope's teachings and the Pope's personal teachings ... while it does exist, isn't applied the way you're using it.

Whenever the Pope teaches in some official capacity, those are not his "personal" teachings anymore.  Typically we can distinguish what the Pope intends to teach "as pope" from what he intends to teach as a "private theologian" from whether or not something show up in the official publications of the Holy See, i.e. in recent times the Acta Apostolicae Sedis.

That's to be distinguished from a Pope answering questions on the papal plane, or giving a sermon (that he doesn't put in the AAS), or even from writing a private book.  So, for instance, Ratzinger published 3 books (or, rather a 3-volume set) while he was (putatively) pope, and in the preface he quite clearly stated that these were not Magisterial in any way.

NOW ... it is true that even in the Magisterium, the pope's official teachings, the pope might be in error if some teaching doesn't meet the notes of infallibility.  And this is where the dogmatic SVs err, exaggerating the scope of this "infallibility in the strict sense", as Msgr. Fenton aptly called it.

But, on the opposite side, where R&R err is in developing this attitude that non-infallible papal teaching is optional, where it might as well be your local parish priest saying something from the pulpit where you can basically "take it or leave it", as you usee fit.  That's completely false.  UNLESS a Pope teaches something that you cannot assent to because it contradicts a prior pope or some higher authority, we are bound to accepted it as true.  Then, even in cases where we cannot accept it as true because, "hey, this Pope is directly contradicting what previous popes taught ...", where accepting this teaching would require rejecting the teaching of other popes, but even in cases where we simply cannot accept a teaching as true, we must accept it and shut up about it and not contradict the Holy Father, EXCEPT where accepting it and obeying it would be against a Catholic's conscience.