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The issue, I think comes from lighting. For example, when you have an ELS vehicle in stage 3 lighting, it is casting the colors/lights all over the place (within the defined parameters of the ELS.ini file) so it might be that new introduction of lighting is causing screen flickering which would be an Adaptation related thing but even after putting your visualsettings.dat file in it didn't fix it. What it did was cause light coronas to be majorly enlarged (it only effected certain color coronas) [SIDENOTE: I believe was not on your part but instead my own because I use the latest NVE that uses RESHADE so its probably due to the preset config]

I am still investigating the causes of why the screen flickers but I'm pretty sure it involves the fact GTAV is a 10 year old game and the default lighting engine isn't that good and does need improvement.

Overall though, Good job and thanks for putting this out to help players fix the issue! <3