hlsl_prescale_x/y have been removed with 0.172. You'll get the most sharp prescaled image by default without wasting performance due to a too high prescale. If you don't get a sharp image, please show me your results in a screenshot and check if your shader files in the ./hlsl folder are up-to-date.
Regarding to your mame.ini settings be aware, that these settings are only used when no other [custom].ini overrides them, e.g. the raster.ini in the ./ini/presets folder.
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