So we started with a couple attempts on Heroic Morchok 25m last night, everything seems to be fine in terms of HPS and DPS, however, we are consistently losing people to Stomp. We know that Stomp hits the 2 closest targets for double the damage, and we have a rogue 'soaker' standing right below the boss so that he's supposedly the closest target to Morchok/Kohcrom besides the tank. The rest of the team is standing behind the tank (we're all ranged and healers), so our configuration looks something like this:
(Rogue) (Boss) (Tank) (Ranged/Healers)
However, the double damage thing from Stomp seems to be occasionally hitting someone from the ranged/healers group (one person from the group will take 200k from Stomp and drop, while the rest of us take about 90-100k). It's not that the rogue is positioned badly, he's literally standing between Morchok's legs while the tank is a little in front of Morchok, and the rest of us are behind the tank, so there really shouldn't be a reason why we're taking the double damage. The only reason I can think of is that even though we're standing behind the tank, we're still stacked close enough to Morchok that we're within his rather large hitbox and thus are the 'same' distance away from the boss as the rogue is? He hardly ever takes the double stomp damage though, which was confusing us all night (his total damage taken from stomp is about half the rest of the raid's)
Would greatly appreciate it if anyone could help us shed some light on this matter