Anything that says motion processing, motion this or that, smoothing, noise reduction, etc… just turn it all off.
It’s all there to smooth out rubbish quality inputs or to overly smooth films so they look more like live daytime TV than a piece of art.
Also mess with the contrast, colour/saturation, brightness and especially sharpness. The latter can usually be turned down to zero unless the input is standard definition being fed off SCART or worse. Usually there’s a ‘film’ preset which is often better than the over saturated mode used to demo TVs in shops.
Basically, turn all the crap off and tone the picture down, then start from there. You might want to re-enable some a little over time to suit.