I’m traveling right now, but will get you the info in a couple of days. The Classe is a CT-SSP (same as SSP-800).Post a link to the exact Classe unit you have so we can review specs.
As well as a new config file while sending multichannel lpcm so we can review.
I also want you to try using the spdif output to the classe when the hdmi audio out has no audio.
This will see if the classes sees any audio from the spdif output.
Please test this and report back.