Ultramontanism, the radical commitment to the current teaching of the Pope, is simply repackaged Modernism. Any attempt to move away from Scripture and authentic Tradition leads to an abandonment of Truth Himself.
Sola Scriptura does not take from but reinforces the authority of the Catholic Church. The Holy Ghost works in His Church to bring us closer to the Scriptures.
As seen in the Church Fathers, even if St. Peter is the Rock of Matthew 16, the modern papal doctrines do not follow. Rather, a proper equality of bishops is taught by the Sacred Scriptures and the Church Fathers.
The Apocrypha was widely read by the early church but not generally accepted as inspired. Here's Apologia Anglican's first full video: on the Apocrypha.
While Romanists claim the Pope creates unity for the Catholic Church, it is actually a false unity which harms the Catholic Church.
The greatest problem in the Catholic Church today is Modernism. While usually a concern among Romanists, it is a chiefly Protestant concern.
The problem in historically Anglican churches has been a problem of a false view of God leading to a false view of man.
St. Anselm, Archbishop of Canterbury, gave an explanation for how the contemplation of God leads one to know He exists.
Just as a civil kingdom is a perfect society, so is the kingdom of God: the Catholic Church.
Anglicanism expresses the authentically catholic view of the Eucharist, grounded in Scripture. Neither reductionistic Zwinglianism nor excessive Romanism.