So I'm currently got a Kanan/Biggs build as my list for the upcoming Open event. However I keep looking at the double Shadowcaster list below.

Double Shadowcasters (99/100)
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Lancer-class Pursuit Craft: Ketsu Onyo (38 + 15)
+ Push the Limit (3)
+ Dengar (3)
+ Glitterstim (2)
+ Shadow Caster (3)
+ Engine Upgrade (4)
Lancer-class Pursuit Craft: Asajj Ventress (37 + 9)
+ Push the Limit (3)
+ Latts Razzi (2)
+ Glitterstim (2)
+ Gyroscopic Targeting (2)

My main worry with this list is does it have enough firepower to hurt Defenders and the like. Or is it a bit lacking?!