After last update, on my sorcerer, I'm getting aggro like never before.
First vBRP run after update (3dd run), using single pet (matriarch) I was over targetted by any mob.
At me they threw:
88% archer's quick shots
82% cold mage's frost bolts
65% infuser's bolts
47% spider's spits
37% beastmaster's light attacks (63% on tank after taunt, no other dd targetted)
Resulting in more damage taken than tank.
The event was repeated in subsequent runs.
Don't tell me is the matriarch, I've lot of log before update with same setup and a very different trend.
In VDSR last boss, sirens gave me 90% of their bolts.
I think something is broken. May be when you worked on pulls aggro, I dunno.