You should worry more about survivability, go tower shield, and get a fast delay weapon 1.1 if you can. Spec Wis / Agi. And don't worry much with this spell.
Also, as I stated in another thread, Pump your ranged crit/DA as high as you can.
And Idk why you would want all your points in eof tree, once you max regen and gut roar lines, the rest is useless...