Not liking that Kayle nerf...
Sorry but a 3% armor and mr removal vs a 10% damage amp... I'd take a hit to her slow vs removing her damage amp.
Also, "Battlefield control" doesn't work on a single target slow. No matter the duration, no matter how much MS it removes. Single target slows are only useful when fleeing from a single enemy, or chase a single enemy. Now, without her damage amp, she won't be able to make the ADC go "OH ****" like a Rengar or anyone else that can jump on them, and her Q's, pretty much, useless during a teamfight.
If her Q would apply more of her passive the higher the rank, I won't have much of a problem. Like, one stack at rank one, and five stacks at rank five.
Hell, flat out removing her slow is better than removing her damage amp.