Thanks @kofa
I tried again with both v2 and v4 perceptual profiles, compared to websafe.
I made sure to compress history before each export (in case that affected filmic gamut mapping, not sure).
v4 perceptual was identical with lcms2 on or off.
v4 perceptual was very similar to websafe relative, but noticeably different.
v2 perceptual was near identical with lcms2 on or off, difference hardly noticeable.
v2 perceptual was near identical to websafe relative, difference hardly noticeable.
This shows that the different profiles, intents and lcms2 settings are actually doing something, which is good. However, none of it looked like the perceptual result @RawConvert posted above, so I’ve no idea how he achieved that.
I do too, but want to compare / fine tune with perceptual profiles.