I argued that Sola Scriptura is the same as Solo Scriptura, and that in the end there is no formal difference between the two.
Called to Communion did a post on this a long time ago which was brilliant. Please read it, or at least part 4 where the Catholic argument begins (http://www.calledtocommunion.com/2009/11/solo-scriptura-sola-scriptura-and-the-question-of-interpretive-authority/)
Their basic argument is that Protestants define 'the gospel' being preached as a necessary pre-requisite for a Church. With Sola Scriptura, the individual reads and defines what the gospel is for himself, and then picks the church that agrees with him. If at any time the church disagrees with him, he leaves and either establishes a new church or joins a new church that agrees with his view of the gospel. Therefore, sola and solo scriptura are the same thing in the end.
Their argument is more nuanced but that is the basic line of it.
Protestants can talk about submitting to the Councils, but if I say to them "one baptism for the remission of sins" they deny it, saying baptism cannot remitt sins, because the bible says: x. If I show them the second council of nicea (787) that declares iconic veneration of Christ and the Virgin, they say it can't be true because of what the bible says. Thus even the universal agreement of the Church is not enough to trump their own private interpretation. Which is why Solo and Sola Scriptura are no different.
This was pretty much the straw that broke the camels back for me with Anglicanism. I wanted to refute what the priest was saying in his sermon on sunday, but I know that all I can do is offer my interpretation of scripture and the councils and Tradition of the Church, but in the end, Anglicanism allows the individual to decide and interpret whatever they want.
True submission, is accepting the teaching of the Church when you DON'T personally feel it is right. This can never happen in Protestantism, because the Church always has to remain subject to Scripture, which means it has to remain subject to the individual's interpretation of scripture.