There are only like 3-4 valid ways to handle refresh rate related stuff in mpv, if you disagree you're a massive retard and don't reply to me.
>method #1: VRR (G-Sync/FreeSync) capable display + --video-sync=audio
>method #2: --video-sync=display-resample --interpolation=yes
>method #3: --video-sync=display-vdrop --interpolation=yes
>method #4: absurdly high refresh-rate screen + --video-sync=audio
We're talking 240/360/480Hz displays here. at this point, the frame-timings are so low that dropped v-syncs are not humanly perceivable (as low as <3ms!!). Literally do not bother with anything except the defaults and fixed v-sync blocked presentation.
If you use anything else, you're NGMI and you should reconsider your config.