this is what i use at the moment, still new to whm dd
Augments are
body: att/dual wield
gorget: dex+1
offhand (dmg +7 str +4? i dont remember at the moment)
Obvious upgrades would be
Naboot 2~4
Tatsu pants with haste and acc/att?
gorget with crit rate augment
rajas (just need to finish it up)
few pieces of blessed +1 but expensive
Goli body for high haste
edit: What i've noticed in parties is when i DD i feel like tping takes forever, damn clubs make it take so long to swing. Fulltime hasting myself still doesnt seem to be enough so i would probably put more dual wield and haste, as well as get the OA 2~4 to help speed things up. Ideally i think KC would be best even though the damage would be low you could keep up your hexas