The ekko nerfs have done an abysmal job of weakening him. He still builds tank, and is still obnoxiously strong while being impossible to kill and chase. He does not need compensation on his scalings, he just needs straight nerfs. Raise his cooldowns, and reduce his base damages. That is all it takes.
I've seen so much of Ekko that I'd honestly cheer if Riot straight up Eve'd him. If champs like Eve have to suffer, then Ekko should damn well suffer too as he's far more frustrating than Eve ever was.
Maybe Riot can literally do what they did to Eve and just remove his stun. It's way too easy to hit and far too good utility, just having it encourages his tank build.
AP scaling on Ekko's utility's got some promise and its something we're currently testing out as part of a set of changes aimed to pushing Ekko furter towards AP builds/away from tank builds in patch 6.11.
Changes we're currently testing (subject to change as usual of course):
- Q outgoing damage to 40-100 + 0.2 (from 60-120 + 0.1)
- Q slow to 30% + 10% per 100 AP (from 32%-60%)
- R damage to 150-450 + 1.5 (from 200-500 + 1.3)
They weren't nerfs, they were lateral changes if anything.
He needs actual nerfs. The kind that were levied unto 
each time she saw play (I.e. straight up gutting).
