Well according to me you should ofc put the most in REC so you can tank easy and take much damage.
Wis and mana should you link and try to get gear with good Mana and Hp OJ..
As you said using hailstorm is a great idea but you will probally need sonics for that, i think grape icecream will work, but it will get much easier with sonics.
Link REC/WIS and some INT to your gear!
For the weapon Toxic would actually be a good idea, and if u get much mana you should get a confusion lapis on your weapon. And use a dagger for faster attacks not a staff!
Hope this will help you a little on the way, and GL