I had a hard time watching too, due to the jittery nature of the clips.
Fwiw, this doesn't feel like completely user introduced jitter in the shooting. It looks more like a playback/technical sync issue, or something like that, or maybe some kind of stabilization setting issue, or possibly a loose mounting issue. There's something that doesn't feel natural to me regarding the jittery nature of the video. I don't know what FCP is, but there could be a format issue between that software (?) and the camera? Maybe some kind of processing dropped frames or something like that?
At 3:20, for instance, I really notice an unnatural nature to the video. It really stands out to me when the camera is moving from one subject to another.
Nice colors and cool octopus footage!