I'm relatively new to this game and only have 1 char (a Punisher). I'm using a weapon with Max Ch-ATK stat so I can do Chakra damage. I've noticed that now that I got Ch-ATK ALL my attacks do some Chakra damage (displayed as purple numbers). Even though descriptions for some Punisher skills (like Demolition or Atomic Bullet) explicitly state that "Higher Ch-ATK yields higher damage", I don't notice any difference between the Chakra damage when using those skills and all the other skills. Of course, it's random but those "Chakra-based skills" do NOT produce consistently higher results, as one would expect.
So, can anyone say, why this happens? Do I misunderstand something?