Torven has researched hate mechanics exhaustively for TAKP and I'm pretty sure they've been implemented here.
http://www.eqemulator.org/forums/showthread.php?t=39819
Quote:
The sit bonus is different depending on if you are inside or outside of melee range.
The inside melee range bonus is thus:
Up to around 13k hp, the sit bonus is equal to a non-damaging detrimental spell (hitpoints / 15) with a minimum of 15 instead of 25.
After ~13k hp, the NPC's sit bonus actually starts to decline down to 0 at 100,000 hitpoints with the function bonus = -hitpoints / 100 + 1000.
The outside of melee range sit bonus is also equal to a non-damaging detrimental spell (hitpoints / 15) but it caps at 1000 and stays there.
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So if a mob you are fighting has 1000hp, someone sitting down on the hate list is going to get 66 hate added to whatever their existing hate is. That could cause the mob to turn.
Might want to review that and see if it explains what you're seeing.