I don't think you should overlook the Unstoppable effect of Surging Dash, the fact that it breaks existing slows and roots, and then provides immunity to any further slows, roots and stuns (and silences), makes it very good for both chasing and fleeing.

As an added bonus, your Surging Fist becomes uninterruptible, so you can charge up the distance to max without having to worry about getting caught.

For anyone that cares we have updated our core build a bit.

Cho - Consuming Fire, Seared Flesh, Firestarter, Hammer, Runic Feedback, Molten Block, Gift

Gall - Eye/Taskmaster, Bomb's Away, Double Trouble, Twisting Nether, Searing Shadows, Deafening Blast, Shifting Nether

We have found that once Runic Blast starts to stack high, it snowballs out of control. So we prioritize that in the build and added more burst with Twisting Nether. Cho's ability to reduce the CD of Runic Blast has also proved more helpful than the heroic CD but that is personal choice.

Feel Free to ask any questions ^^ We're always changing stuff to see what works.