OFC AV1 is still banned here. I don't know why I kept my hopes up.

AV1
Filesize= 2.55 MB (-24%)
Bitrate= 409 kbps (-24%)

>>107137079
VMAF scores between 90 and 95 seem to be the sweetspot and you can easily verify this with ffmetric GUI if you can't use the standalone vmaf executable. If you mean encoder settings then SVT-AV1 is king for that as it encodes faster than x264 while providing smaller filesize compared to H264 on the default preset 8/10 already. If you have time preset 5/6 can net you another 10-20% lower filesize. Throwing 10-bit in there will get you another 10-20% lower filesize but tank your FPS so you probably shouldn't use that unless you have a lot of time on your hands.