I currently use Jotun aswell as Ragemonger in my Clanboss setup.

So i happen to notice that Ragemongers HP-Burn only does 2/3 of the dmg (50.000) that Jotuns does (75.000).

Since the Damage should be based on the enemys HP i dont see a reason why this should be like this.

Therefore i tried to use both HP-Burns in the Dragons Lair and they seem to deal the same amount of Damage there.