So you strictly adhere to the fact that their have been no Popes since 1958?
The facts do not depend on my assessments of the situation or on the level of strictness with which I adhere to my own moral decisions.
I repeat: The answer to the question whether a specific pope (or any other person) is a manifest heretic or is not a manifest heretic depends only on his past and/or present words and deeds.
Now, you and I have to inform ourselves about the true faith and about the persons who pretend to have apostolic authority, who pretend to have been sent by Our Lord Jesus Christ to guide us. We have to verify whether they teach the true gospel or whether they lead us to hell. Then we have to follow our schooled conscience.
How about 1938? Pius XII did some pretty shaky things like the reform of Holy Week? Pius XII promulgated Vacantis Apostolicae Sedis which permitted an election of a pope who is a heretic before he goes into a conclave? Pius XI sold out the Cristeros? Benedict XV was a secretary of C. Rampolla the Mason? Pius IX promulgated Pastor Aeternus which got us into this fix of picking between a Pope and the Apostolic Faith? Where does it stop?
Well, said popes may have been manifest heretics too. In case of doubt you should look for heretical statements. We're not talking about incomprehensible words or acts, or about possibly suboptimal administration, but about manifest heresy.
At the robber council of the 1960s there were gathered roughly 2500 bishops of the Church (as far as they hadn't been manifest heretics before) declaring a series of heresies in a most solemn way. All their constitutions, decrees, and declarations have a statement claiming the assistance of the Holy Ghost. Being the highest apostolically authorized shepherds of the Church gathered in one place, they have no excuse of the kind "sorry, we were not aware that we're contradicting defined dogma".
If you can show me, where Pius XII, Pius XI, Benedict XV ... uttered heresy without possible excuse, please do so! I am interested in the facts.