Vi's Ult Change
Have her take 35%-27%-20% increased damage from all enemies except her target while ulting. This would make sense logically due to her zeroing in and having intense tunnel vision. Just makes some sense to me, and this adds more of an incentive to take her down during that time.
To clarify this is only during the time it takes for her to get to her target, and NOT while she's in the air.