Yo I died in east mjolnir from this op fall dmg increase. Normally you can run down that slope away from the needle fabres to the giant flips area and only take like ~400 dmg... I slid down my normal path and insta-death.
I suffered that one too! But my fall shouldn't have done even that little damage, wasn't falling for even a second.
Another death spot is Edze in Sograt Desert, every time I battle leap him it's a one-way ticket to my save point.
Also in Prontera, sometimes I fall from the middle point of the short starircases in the outer zone, which are barely taller than a human character. Bam, half of my HP gone.
If they don't know how to fix this, they should outright disable fall damage entirely. Or add some *0.1 multiplier to the formula.