Had to apply deinterlacing with NL-Means set to Medium, Tune set to Film. That got rid of a good amount of grain while still leaving some and not making things look plasticy. I then applied extremely light sharpening to compensate for the small amount of softening the denoising caused (LapSharp set to Ultralight, Tune set to Film) and the results came out pretty good if I do say so myself! No more distracting compression artifacts.
This was my first time ripping and compressing a UHD source, this came direct from my 4K Blu-ray. The source file was 57GB of 4K HEVC video. I converted it from HDR to SDR by changing the colorspace from REC.2020 to BT.709, but kept the 10-bit color rendering. Resulting file is 3.9GB of 1080p 10-bit HEVC video that looks more than adequate on smartphones and even most computer monitors. I'm happy.
I'm also never doing UHD-sourced encodes again because that took my new, super powerful rig about 33 hours to do. Anyways, expect the first couple episodes of TNG to start hitting the Archive by the end of the week. Those will all be standard AVC/H.264.