Stereo Tool

I am wanting to do restoration work on some lossy files that have both spectral holes in it and parts of the highs cut off.

I can't find *proper* documentation that explains what settings should be set to what for optimum/max/best restoration for each of the different pieces. Does anyone know?

Here are the various settings screens at their default settings: https://imgur.com/a/j0W5kQ9

I've experimented with the delossifier set to work from 500hz and effect strength set a bit higher, it sounds richer without noticeable negative effects.
With absolute highs it's harder as i personally can't hear any difference while changing anything other than threshold (Which i set at -100).