It’s been a couple of weeks with the Tempus so this morning I decided to switch from fiber to copper. Using a 5m AQ Cinnamon Ethernet cable I had laying around I connected to one of the “built in” ports instead of an SFP. To my surprise the Cinnamon cable sounded at least as good, and maybe even a little better.
The LHY FMC and associated SFPs/fiber is out - now I’m thinking I need a better Ethernet cable.