Trying to revive a build - Scion Spark

Hello guys,
i'm here because i need help to trying to revive a build with spark.

The build is: http://www.pathofexile.com/forum/view-thread/1591600

Now no-crit is impossibile so i try to transform it to crit. The core item will be the same but i need help for the tree skill.

Here my try: https://goo.gl/huavnd

Hope for some help!