(sS) does not take into account the Tradition and Church authority that formed it and canonized it.
1. I (and the RCC) disagree with you that the RC Denomination wrote God's Scripture. You need to explain how the RCC wrote the Ten Commandments on that Mountain and how the RCC told the Hebrews that it is Scripture. I disagree with you and agree with the RCC that teaches that GOD is the creator and author of ALL of Scripture - not the RC Denomination.
2. Your denomination did not "decide" for any but itself as to what Scripture is and is not, which is why NONE agree with it on that topic. It has a grand unity of NONE on that, it agrees with NONE. If it's the "leader" or if it's the "authority" then where are the followers, why does not but itself recognize it? And ask yourself: if IT decides this, when why hasn't even ITSELF follow that? For some 1000 years, it mysteriously added a 28th book to the NT and then mysteriously dropped it - even it paid no attention to it's own decisions in this regard. Certaintly, no other does.
3. As you know, what is and is not Scripture is not an aspect of Sola Scriptura. Sola Scriptura is a PRACTICE, it has to do with DOING, it doesn't teach anything (anymore than taking a shower in the morning or drinking a cup of coffee). Sola Scriptura is a PRAXIS - the practice of embracing Scripture as the norma normans in the evaluation of disputed dogmas among us. It doesn't TEACH or DECLARE or DECIDE what is and is not Scripture, it cannot teach or decide or declare anything, it's a PRACTICE. The Rule of Scripture (Sola Scriptura) doesn't declare what is and is not Scripture anymore than the Rule of Law declares what is and is not the law in every jurisdiction.
4. Look. I can understand why you, as a Catholic, would be disturbed and troubled by the fact that your denomination doesn't agree with ANY on what is and is not Scripture. It stands entirely, completely alone on this issue. It has a unity of NONE on this. I can understand why that bothers you a lot. But it's another issue for another day and thread. And frankly, no one cares about your denomination's extra DEUTERO books which is why it's never been much of an issue. Your dernomination doesn't care a bit about them and nor does anyone else. Look, if you want to call them Scripture - no one cares. The RCC and LDS are so opposed to the Rule of Scripture NOT because either agrees with any on what is Scripture but because each rejects accountability and norming by ANY rule. It's accountability in the sole, singular, exclusive, particular case of itself alone that they so passionately reject. THAT'S the "problem" for them - not that no one and nothing agrees with each on what is and is not Scripture.
.