Egad, not this old argument again!

1. God ORDAINS all things.
2. By His providence He brings all things to pass which He ordained.
3. ALL creatures are fully responsible for ALL that they think, say, and do. None are forced to do that which is contrary to their nature(s).
Thus, the 'secondary causes' is a valid argument and is sufficient to counter the claim that "logically" God is the author of sin. Secondary causes are God's providence. The 'problem' isn't God's absolute sovereignty.

The 'problem' isn't why Adam sinned when he had no propensity toward evil (corruption of nature), regardless of the external temptation of the serpent (Satan). The biggest problem is how Satan and all the myriad angels sinned (rebelled) against the Almighty when they had neither a propensity to sin nor any external influence to sin.
The answer is... Deuteronomy 29:29 "
The secret things belong unto Jehovah our God; but the things that are revealed belong unto us and to our children for ever, that we may do all the words of this law." Since the "how" these two truths can and do exist isn't revealed it is sheer lunacy to speculate how these things occurred. What is required is that one believe what IS written; God is absolutely sovereign and has ordained ALL THINGS. And, that man is absolutely and completely responsible for what he things, speaks and does. Truthfully, how can a human being hope to arrogantly comprehend, with his infant wisdom, the infinite wisdom and power of the almighty, thrice holy God?

Lastly, there is only one individual that I am aware of that has published a paper and which is readily available online who asserts that God is the author of sin. And that person's views are far beyond hyper-Calvinism.

Oh yeh.... as I've told you so many times in the past, There are no "Silver Bullet" answers that are guaranteed to convince someone who is opposed to the truth to embrace the truth. The TRUTH is from God and stands immoveably on its own. We are simply to speak that truth and the Spirit of God is the One who does the convincing, either via regeneration of unbelievers or enlightening the mind of true believers.