Mitchell creates data where it doesn't exist. That is the nature of a sync type filter. If you want sharper detail, try gauss with a smaller window like 2 2 or even 1.6 1.6, eg.
As for non-brute force FG, it will be calculated like regular interpolating FG wherever each sample occurs. So that will not affect FG point density, or rays, but could still make something look smoother. If you are going to reduce your filter window, for example, the greater number of samples from unified could help you.
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