Hey Brian. Here's what I'm running, maybe it will help. I have the 8500, one HDMI to my Marantz AV7005 audio only and other going direct to the RS400 via a 20' run of Blue Jeans Cable Series 1 Certified Premium. The 400 has had the firmware upgraded and has the new rec2020 color profile uploaded and settings comply with guidance just released from JVC for HDR. My 8500 outputs home screen at 4K/60fps and BJC cable carries no problem. Also running FW1003 for the Samsung 8500. I'm not allowing it to upgrade to 1005 (1004 was pulled it was a failure) until I know for sure its stable without issue. Hope that helps.
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