Hi,
I think you need to ensure that your Post Process Volume isn’t being overriden by other Post Process Volumes ie. set your PPV to a much higher priority, that ensures it doesn’t get overriden (besides ticking “Unbound”).
When recording from Matinee to Movie (frame by frame PNG) ensure your Post Process Volume AA is TXAA and try Screen Percentage 200% (a kind of SSAA).
Or, you can record Matinee to frame by frame PNG at say 4K then create resized movie using ffmpeg at 2K, etc.
I used TXAA, Screen Percentage 100%, and Matinee frame by frame PNG 4K, then used ffmpeg to create mp4 then upload to YouTube for the 4K videos* at:
*One video is not 4K but 2K recorded using Open Video Broadcaster out of Apple Keynote downscaled to 1080p.
Check out the Lightmass settings in the ArchiViz section, those guys know the best settings 