I have also CAC-1070 and audio works there well. I have NVidia Quadro T2000 which should be included
in your spec as recommended. I have powerful Tiger Lake 10th gen processor i9. My suggestion is to make more buffer in firmware for audio streaming plus maybe some priority boost for thread which streams audio when buffer if near limit. I am using 10 meters very expensive HDMI cable Kabel HDMI Oehlbach 92577 [1x złącze męskie HDMI – 1x złącze męskie HDMI] 10.00 m | Zamów w Conrad.pl at 30 Hz refresh rate at 4K on my Philips 65OLED854/12 TV. Please fix audio sporadic pause while watching YouTube music and also content from Topazlabs Video Enhance AI application which I am using for commercial use. New firmware will be needed I guess so contact my on my email.