I think I was feeling confident enough during the interview, but it's entirely possible that some of my cynicism bled through in my intonations in the Zoom call.
I do tend to be long winded when I speak, so maybe that is working against me. I'll actually take that in mind.
It's definitely worth practicing to be concise and clear in your responses (and don't waffle on - something I'm guilty of). Learn when to stop talking too.
But of course that can go onto infinity; at some point you need to summarize and accept you can't be 100% accurate. I guess I need to figure out how to strike a balance between "blathering on" and "hand-waving away details". I have no idea how to do that but that might be a good thing to get out of mock interviews.
The problem is, of course, that even handwaving things away, there's still a near-infinite number of potential caveats for any given subject, and I always feel a compulsion to list all of them. I did bother a friend of mine last night in order to get him to tell me how much of my rambling is tolerable so hopefully I have a better handle on it now.