I taught the catechisms of "Sacred Tradition" and was schooled in it for 25 years. I don't think Sola Scriptura is anything but a way of stating succinctly a central spiritual truth. Paul is my Apostle, not Augustine or Aquinas or Cyprian... or whomever. We all stand alone, naked, before him with whom we have to do. We all must study to show ourselves approved unto God, rightly dividing the Word of Truth.
As Luther noted, the men deemed the arbiters of faith (in our case) often contradicted each other (and still do). As he said in his defense at Worms:
"Let my errors be proven by scripture... unless you can convince me by scripture (and not by popes and councils who have often contradicted themselves), unless I am so convinced that I am wrong, my conscience is captive to the Word of God. To go against conscience is neither right nor safe. I can not and I will not recant. Here I stand. I can do no other. So help me God."
Luther was accused at his trial of opposing "established truths which have passed into usage, rite, and observance... things you are obligated to believe." That he did, and rightly so! The Roman Chch doesn't even uphold its own traditions. As with all doctrines of men, they ebb and flow with the tide of men's desires and follies and whims. Scripture is the only solid rock upon which to build.
Now, to those who want to look to things like "church fathers" and "traditions" and "long-held truths," I say, feel free to do so. You have a free will. You have a choice to make. I know what my choice is and I demand no one follow me. It matters not to me what choice others make.
In 1054, Pope Leo IX sent an emissary, Cardinal Humbert, from Rome to Constantinople. The cardinal's visit with Patriarch Cerularios was meant to be a mission of conciliation. It became anything but. The cardinal excommunicated the patriarch who, in turn, excommunicated the cardinal. The main point of contention was the use of leavened bread during the celebration of Mass… While it is commonly accepted that the separation of Rome and Constantinople into two Christian Churches was the result of centuries of conflict, the event became known as the Great Schism of 1054. The schism, which reflected numerous long-standing tensions between the eastern and western Roman empire, may have been inevitable. The Church had remained united for centuries without solving several theological disputes.
So, by their own admission, there were theological disputes for which there was neither agreement nor direction. What was the layman to do? He was subject to the whims of men. And over time, those whims would change.
This is why we call each individual to study to show himself approved unto God, rightly dividing the Word of Truth (2 Tim 2:15).