So took the "best build" (standard one) and take one point off icestorm and put it in fire?

You could elaborate more on the bird combo as almost all of the birds at 30-40 are warbirds time the heal so that you free through roots since you don't want to take damage of the heavy melee autos they do

Also you should use paw/dark wand(cheaper option) against bears as you don't want the pin to fire and free them from the ice