LeBlanc: Would moving damage from her W to the root portion of E as a nerf make you happy?
Take a large portion (not all) of the damage on (W) Distortion and place it on the secondary damage/root of (E) Ethereal Chains. This would mean that theoretically she retains her max damage, but in reality she must not only hit her (E) but also stick around long enough (1.5 seconds) for it to proc the secondary effect. A smaller nerf would be put the damage on the first part of (E).
Poof, her full burst damage isn't done in a fraction of a second and it's possible for you to counter against it.
Disclaimer: I personally don't have a problem with LeBlanc. I am a Support main, so I rarely have to deal with her myself anyway. This is brainstorming brought on by seeing tons of "LeBroken" posts.