Hi!
Hmm. Sorry to hear that. I only do audio post for TV here, so I never needed to bounce any outs back and punch in with them, but I thought what with the latency compensation and all, that wouldn’t be a problem.
Hope you’re cool with moving to PT, I know I wouldn’t be…
Well at least I think I can help you there. You can loop back an output to an input in the Fireface and meter that input with DigiCheck. I know, It’s a bit ridiculous, but if you reeeealy miss DigiCheck…
RME says they’re working on a solution for Core Audio in that respect, but they say themselves that it’s not high priority…
Anyways, lots of success!
I see you hail from Doylestown, btw. That’s cool! 
I grew up in Ambler. Say hi to Montgomery County from me on your next drive to Philly!