I found a solution for me that results on zero dropped frames due to both encoding and render lag.
First, the stream encoding settings are set to 6,000kbps on x264 medium.
Second, the recording settings are set to AMD H.265 30,000kbps.
When the CPU was encoding recordings, it did not like it, resulting in unstable rendering or recording lag in intermittent pockets. Now that the GPU is handling the recordings, it is entirely stable: zero dropped frames across 6 hours of streaming.
I guess I don’t need a RTX card now!