I'm confused. There seems to be some mixup between proximity aggro and sit aggro. It sounds like you guys finally fixed proximity aggro, but made it to sitting players only? All players nearby an engaged mob should be put on the aggro list via proximity aggro. See the fansy the bard thing.
Sitting did give you more aggro, like an aggro multiplier, but not something a disease cloud/flame lick or whatever couldn't take care of intially. You wouldn't sit on inc because a lot of the time the puller wouldn't have more than proximity aggro... so your sit proximity aggro would be higher than the puller's low aggro. Later in the fight I'm sure while you sat it was still just a multiplier of whatever aggro you had, until you stood again.
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