this slam damage
why is my 2hander not 1hitting withe mobs?

i need 30 hits to kill a random weak monster!
its 4link (basicly a 3link, or a 2link) General cry - Earthshatter (i not liked dominating blow anymore not working vs boss) - added fire - phantasm
basicly its a 0.9link damage (40less*35%added)
but still, i do it 5times per click
why do i need Hallow Palm technics and 6link, and beserker*1.5*1.4 to make this work?
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maybe i just do it on my hierophant, with 66.6%lesss damage compared to beserker, but 100%more AoE and 100%more support active skills damage like cwdt and brands