Collective anguish - doing less damage for vengeance than expected

Using my own demon hunter as example, which is only around 205 ilvl.
Fel devastation tooltip is about 3500 dmg over 2 seconds when Vengeance spec.
Eye beam tooltip is about 8500 dmg over 2.5 seconds when Havoc spec.
As I mainly tank, and have the collective anguish legendary, i would expect the damage to be approx 3500 + 8500 for aoe, but when i check logs eye beam is typically less or at most equal to fel devastation even when ensuring eye beam hits the targets. I also have typically about the same amount of hits from each ability and while eye beam only crits, the average hit value is approximately equal with fel devastation typically having slightly higher average.
I think there must be an error in how the damage for eye beam is calculated while in vengeance spec, unless it is intended to be a much weaker version of eye beam.
Does anyone else use this legendary while tanking, and what is your experience?

I have now tested in Havoc, and here the eye beam does the correct 8.5k with fel devastation doing a correct 3.5k, so it again seems to be a bug with how eye beam damage is calculated for vengeance

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