Cool, well thanks for checking back in about this, I have never been that happy with black magic stuff for a while now, it always seems to work but only with a lot of hassle.

Glad to hear about the Aja, Latency isn't usually my biggest concern as much as just looking like a smooth capture without any frame dropping, or just without looking like it's an internet stream… which seems typical with external cards.
Hopefully this will give some life to external captures over thunderbolt 2 without an expansion chassis,

What machine were you testing this on?