For the Zabrak, perhaps take the sub-species route as done with Aqualish and to some extent the Gand (lungs or no lungs)? Such that Dathomorian Zabraks (like Savage Oppress and Maul) get the Fearsome Appearance trait, but the Iridonian Zabraks (like Eeth Koth) get the Boosted Awareness trait?
Was thinking the same thing when I saw the new Zabrak stats, although, honestly, I don't recall ever coming across Zabrack being notably observant, so something else might more sense for the Iridonians. Not sure what, though.