I think to change the world you shouldn't be sending back hard science books, but books on philosophy or the soft sciences that focus on human behavior and interaction. If you put the knowledge of gunpowder or metallurgy or chemistry in the hands of a xenophobic empire builder (and the Church certainly was) all you're going to wind up with is an imbalance of technological power leading to an enslaved population and a world in peril, if not actively conquered. Grant the church better weapons or the ability to discover new forms of chemical warfare (which has been used since ancient times and was not unknown to them) and they will put it in the hands of a soldier and send him off to kill "in the name of god."
You would have a changed world, but not much of an improved one.
The things that held back knowledge for so long was serfdom and the death grip of the church, which was only loosened by the Black Plague causing enough mayhemto upend and destroy the power structures. But certain philosophies can do so, as well, especially if you can integrate them into thinkers in the church.
But I don't think you can pick a modern book off the shelf and schlep it back in time and call it good. Everything about it will be wrong, from the way it's made to how the words are spelled and even the definitions--language drift is real, and surprising. For instance, did you know some of the words for color we now use used to refer to different colors or didn't even exist at all? Or that "villain" just meant "poor person?" In the meantime, words that sound like endearing nonsense to us (hey nonny-nonny anyone?) had real meaning back then, and it may not have been the most...genteel one.
And that's just a few common, simple examples. Any book sent would have to be recreated carefully to fit into whatever actual century you were sending it to, including having language experts piece together the proper language of the time so the meaning couldn't be misinterpreted or misunderstood.
Also, I'm surprised you didn't mention medicine in your world-changing books, because good medical practice was sorely needed. You want to change the world, send back a book emphasizing one thing--to not kill your patients, wash your hands with soap before treating them. Oh yeah, and sterilize your gear. For the leech happy era, you might send a primitive treatise on how blood actually works; nothing as complex as we have now, but something they could have observed with their own eyes, like how much blood a man can lose in battle before becoming woozy or weak, and comparing it to blood loss through bloodletting, and setting up viable alternatives.
For philosophy, you'd want to build on the beliefs they already have. For instance, how powerful could it have been had they had the belief that the vows of marriage should be held sacrosanct to both parties, and that if the man broke his, it freed the woman from hers. (Or visa-versa.) That would put a wrinkle on everything from warfare (is wartime rape adultery?) to law. It could reshape the entire culture.
For instance, what are the legal rights of a woman who proved her husband broke his vows? Can she demand restitution through money or lands? Can she go back home to mom and remarry without stigma? What about children, can his name (and therefore his lineage) be taken away from them? Would they then be given the name of the mother's family as traced through her father? What are the social consequences on him for failing in his sacred oath to her? Will he fall in society's eyes with all the consequences that implies (no promotions, people less willing to support his business, and other stigma)? Will he be required to pay money in the form of a fine or some sort of "penance" fee to the Church? Will he be considered as a marriage partner in the future or is he now effectively "off the market?"
That's within the purview of the Church, under their direct control, doesn't threaten their power (in fact, can actually help solidify it and bring in extra wealth), and yet could have had us making great strides for women's equality in society centuries ahead of schedule. And as history marched on, that would snowball to giving us more scientists, mathematicians, business people, and so on, changing the face of history forever.
Heck, even encouraging the Church to classify women as "like children" would have been better than "more like animals than people, possibly without any souls at all."
You could choose less women-centric ideas as well, I'm just personally always a fan of any idea that gets all hands on deck working towards solutions rather than marginalizing a large segment of people and taking away from our resource pool.
Agriculture would have been handy too, though the problem is it'd have to be one heck of an agriculture book. Again, it'd have to be rewritten for the period, since many of the machines and chemicals we now rely on they wouldn't have access to, or even the means to create. It would have to focus on natural methods of agriculture, and frankly, you'd have to drop a lot of those books (or one huge-ass tome), because what would be needed to make crops flourish near the Vatican would bomb in rainy Britain. In the case of anywhere with micro-climates, the advice could fail just by traveling for about an hour to a different location.
But hey, you really want to shake up the population, send back numerous copies of the Bible written in the common language of the time. Have whoever your hero is handing them out, and teaching people to read them. For a long time the only people who could translate the word of God was the Church itself, leading to terrible abuses of power. You want to subvert that, beat them at their own game and with a book they can't possibly reject. Then sit back and enjoy the fireworks.