We have no "Zanshin" concept. I think it is one of practices in Japanese martial arts, not Okinawan arts, at least not ours.
Usually I do not do Kiai, but sometimes I do Kiai, especially at a performance in a some kind of demonstraion.
In fact I should have done Kiai in this video, but it was a public place, not a Dojo, so I would have felt a little bit shy if I did Kiai there.

Sanzinsoo practices Okinawan Goju-Ryu.
Sanzisoo, do you normally practice much zanshin in your kata, or were you limited due to the recording? Also, do you usually kiai?