This set is a reward option from the Taris Heroics + zone quests we know
It's an option between Powertech Elite Upgrade pieces (gold)
or the Mercenary Elite Prototype pieces (blue)
except the helmet. Where does the helmet come from? I've ran Spilling Chemicals twice but the Powertech Elite Upgrade helmet is not a reward option, only the Mercenary Elite Prototype helm.
edit: nm, this set is not the reward from taris quests. i have no idea how to obtain this set