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This is the default film grain modeling process: https://gitlab.com/AOMediaCodec/SVT-AV1/-/raw/master/Docs/img/film_grain_fig1.png
Someone tried your suggestions and apparently, at least with the current FFmpeg versions, the flag doesn't affect VMAF (see here). I can only conclude VMAF does already return the highest values possible with AV1 as is, though what you said made a lot of sense so am unsure where exactly something changed from you gaining your knowledge to the current state of VMAF in FFmpeg (I'm a little puzzled).
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