The velocity from fall dmg can be influenced by interrupt resist or poise, and can increase fall dmg to 160%.
Original clip is from xf3, then made to edit to make it side by side. In the video below it shows an abyss mage with 0 poise (stunned/staggered) vs an abyss mage with 2.25 poise. mage at 0 poise was launched at higher velocity than the mage who is dancing. This is easily reproducible.
Before launching an opponent with Jean E, reduce its poise to 0 and stagger them first, then watch your fall dmg hit higher numbers.