[2.0] Flameblast + Vaal RF build

First of all,
I inspirated in here:
It was so funny build in 1.3, awesome clear speed and that burning effect :).
I had a couple strong builds in 1.3, Tornado shot with 400pdps Harbinger or Kinetic Blast wanderer with 330pdps Imbued wand or low-life Mjolner, but I played with this build 99% of all time, because of funny. Now in 2.0 burning was nerfed highly, but this build is still playable and funny too.

This build still works just fine, but you will have lesser life than before, because vaal pact is placed far away than before and you need to spent a lot of points to reach it. Jewels with increased life stat will helps you just fine too.

My Gear:


Passive tree (you can check my jewels here):


Videos 2.0 (you can check older 1.3 videos too on my YT channel):

I'm quite interested in this build.
Building it in Tempest league atm.
One question though: spell echo doesn't work with flameblast anymore right? if that's the case, what would be a good replacement for it?
some gems are coming to my mind: conc effect, faster casting, fire pen?

I replaced Spell Echo with faster casting gem.

Nice coumbination of no survivability and slow clear