What should my primary and secondary mods be for HK47?

1 Crit damage (with potency secondary )
2 potency
3 speed (he's so slow)

He's tanky no need for health or protection. Crit damage is great since a droid team under his lead has good crit chance. Potency is key as you always want him to stick debuffs. I go back and forth between a speed arrow and an accuracy arrow. He's so slow even the extra 30 doesn't do much.