I'd take the opposite view, and say ditch the flash and smoke and get Kraks.
Even if you're not playing a high toughness gang, Kraks wound on 2s vs T3, and are AP-2 and D2, which makes them good champion killers.
Smoke and flash grenades are utility equipment that have situational uses, but are almost always less conducive to the end goal of winning a match then shooting someone with a boltgun would be.