I remember a lonnnnng time ago there was a a web page with a list of Xbox 1 games that could be reduced in size by removing certain files, which may have been part of the game but would still allow the game to function and be playable.

The specific game I'm trying to make smaller is Jet Set Radio future, but does anyone have a link to that page I'm talking about? Or something with the same idea at least?

I know some people re-encoded the video files from games at lower quality...

http://www.xbox-scene.com/articles/split-segadisk.php

http://xbehome.com/xbox/indexe577.html?game=102

Not sure if that was what you were looking for but it might help.

That's exactly what I was looking for! Thanks a lot man