"So what I'm taking away is that the Root Domain DA of 95 is meaningless in this case and that I should look at Page and Sub Domain metrics such as Moz Rank, Moz Trust and Linking Domains."
Exactly!
"Assuming the latter metrics are superior to our site can I expect these links to pass "juice" and boost our organic search traffic?"
Links pass "juice" regardless if the site that's linking to you has superior metrics or not. You shouldn't pass on sites just because their metrics are lower than yours (but I understand if you'd want to prioritize those blogs with higher metrics/social impact).
Regarding the visibility and organic SEO efforts, you should aim for blogs with a high number of subscribers/followers first, and worry about the metrics later (plus, these blogs are the ones with the highest metrics most of the time).
I would even rather have a nofollow link from an influential blogger in my niche than a dofollow link from someone who hasn't written in 6 months. Reason is that, beyond the visibility and direct traffic, the first link might also generate more links in the long run from the blogger's followers and community, which would boost your organic SEO even more than in the other case.
Hope this makes sense, and have a great weekend!