Strength and Dexterity needs of a witch

As a witch, should I take passives that give me str and dex? I'm right next to Might (+30 Str) and Agility (+30 Dex) nodes in the passive tree. I've noticed that I can't use some nice gear or passive gems without one of them. How much strenght and dex do I need? I'm playing a fire witch summoner. I rely on zombies, skeletons, fireball and firestorm.

Thanks

http://www.pathofexile.com/passive-skill-tree/AAAAAgMABUIHYx8CKpgsnDbFQZZJG1cra9tzU30YghCHZZwtpwius6-32CTZC9-w7Ir6gA==

I have the same problem!
I'm unable to use my fire trap or detonate undead because the gems require 1 more point of dexterity, and I also can't level em up :/

Spend 1 Point in the Dex Node (+30) and get +30-40 All Stats Items.


In my Build i spend 1 Point on the Dex Node too.



(Totem Witch Arc)