Riot you are nerfing the wrong thing on a champ again
The issue with quinn is not that her base AD is too high or the like but that her blind/nearsight is too effective and lasts too long especially early game.
If you really want to fix Quinn try lowering the blind/near sight to 1 second instead or at least making it scale up to 2 seconds based on the skill's level.
If you are not going to revert this at least make Tenacity more readily available in the game since 20% from boots is clearly not enough.