Constantly pulling aggro as a newbie monk despite doing less damage

[tranceminus]

Hey guys, just made a newbie monk and equipped him with a Wu's Quivering Staff a little bit ago. He's level 8 so far, and something odd I've been trying to figure out is why I'm constantly pulling aggro off other monks/shamans/necromancers despite all of us being in melee range and the other people actually doing more damage than me.

I've had it to where a higher level monk will pull a mob, drop it to 90% or 80%, I'll go in, swing once and MISS, and the mob still turns to attack me.

The only thing I can figure is that maybe aggro is based off of the potential damage of each swing rather than actual?