why not also include official subs from Hidive, they had also include translations for the op and ed as well.

--crf 9 --preset 5 --variance-boost-strength 3 --variance-octile 1 --enable-qm 0 --keyint 10s --hierarchical-levels 5 --enable-mfmv 1 --sharpness 2 --qp-scale-compress 3 --frame-luma-bias 80 Octile 1 is way overkill for anything and likely bloating the bitrate beyond reason. The lower the octile, the more blocks are selected for boosting but you're already at crf9 which makes variance boost only mildly necessary (if at all) so octile 4 or 5 would make more sense here. Your bitrate would be better spent using --qm-min 9 to make sure you're keeping high frequency detail from being wiped out. Is there a reasoning behind using --keyint 10s? svt-av1-psy doesn't really use keyframes so doing 10s is doing more harming than helping.

High-ish fidelity AV1 is achievable, but this ain't it chief. There is literally no reason to get this over a lower sized AV1 release that will basically look the same (without your contrast alteration trash) because your settings are actually detrimental to efficiency and make the encoder spend too much bitrate for *nothing*, or a similarly sized HEVC release that will look higher fidelity for the same reason as previously.