More books that increase the chance of finding quality items.

Right now there are only a couple of them, and their bonuses feel pretty underwhelming. I’d like to see some high-risk/high-reward books that give a significant increase to the chance of finding quality items, but come with a serious drawback. For example: +4% chance to find quality items, but zombies have +300% HP. Or the drawback could affect looting time, mission time, ammo costs, enemy damage, or even multiple things at once. The idea is to make these books actually change how the mission feels. You’d be taking on a much harder mission for a noticeably better chance at valuable loot, rather than just getting a small bonus with little downside. Basically, I want books that make you think: “This is going to be a nightmare, but the loot might be worth it.”