Revert Kaisa's range to 500.
Absolutely no reason why this marksman should have any more range than that.
She has more than enough ways to get into a fight, and survive in it with her shield and stealth. getting poked and outranged should be a mortal weakness.
has a steroid that buffs his attack range for a long duration.
has a dash with an extremely low cooldown later into the game. Dashes allow you to get of terrain.
has range with her Q and her W bounces.