@Riot, you are nerfing Lulu's whimsy all wrong.
You need to remove all of her AP utility scaling. This means no +%MS scaling on her W.
AP utility scaling was in general a bad idea for Lulu. Support Lulu barely sees any use out of it due to the importance of other support items combined with her lack of farm as a support, so basically what you have is solo lane Lulu being a huge abuse case of this utility ratio. This nerf does nothing to address the fact that solo lane Lulu can easily get whimsy to give her and whoever she wants around +80% movement speed.
This current nerf just hurts support Lulu a lot more than solo Lulu.