I took several knees in the last phase but managed to get melee FL4K through the takedown. Here is the Scourge fight at M10.
Is that the White Elephant bomblets throwing most of the damage?
It is, yes. They are also boosted by the splash damage passives.
Would a x14 Face Puncher throw more per shot? Like are they calculated per pellet or per trigger pull?
Yes, x14 gives more sticky bombs but it is 3 or 4 shots between reloads. I prefer a x7 so less reloading. I use a x14 for Graveward or other bosses that can be one shot.