Vel' koz E should suck enemies in like Viktor's stun.
I think this will help his supporting as well as his midlane. Because of the way his current knockup works, sometimes even when the enemy is hit with the knockup, the enemy gets pushed outside his W hitbox even when placed directly on top of the E.
This buff will improve his overall strength and kinda negate his vulnerability as an immobile champion with 4 skillshots.