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Soloing gear there's a few things to look into.

1. -% DMG Gear
2. +%Haste/Fast Cast Gear for Utsusemi casts
3. -% Magic DMG Gear
4. The Enfeeb/MND/INT sets depending on DoT or Nuke kiting.

1. Cheviot/Umbra Cape, Jelly Ring, Darksteel Subligar, Darksteel Harness, Earth/Terra Staff.
2. Dusk Gloves, Dusk Ledelsens, Swift/Speed/Velocious Belt, Goliard Saio/Duelist's Tabard, Loq. Earring.
3. Lamia Mantle +1, Lamian Kamen +1, Coral Cuisses, Merman's Ring x2, Fencer's Earring (possible.
4. See my last post. >.>

Enhancing, Enfeebling magic merits help. HP/MP Merits, RDM group II and Wind/Ice/Earth potency merits help too.

Spell Interuption rate down equip and merits help a lot too.