Smite damage?

[TheTikiMon]

ive read a lot about smiters and builds getting over 1000 dmg average every smite. i cant seem to get it up that high, im wondering if this info is just outdated or what anyway, here is my skill allocation, and my gear, and i average about 624 every smite

silence phase blade
HOZ: 189 ed and 46/46 smite dmg
shako
sandstormtrex
etc.

skills:
smite: lvl 37-555% dmg
fanticism: lvl 28-my dmg 509% - attack 175%
holy shield: smite dmg -121-124

thanks for all your help and recomendations