I actually figured the issue out :D. It was just one addon mod, the rest of the 130 something work flawlessly with F7YO's gameconfig.

I've tried multiple gameconfigs, heap limit adjuster, packfile adjuster and it still gets stuck forever on the loading screen, it gets stuck on one random loading screen and stays there forever, pushing the loading screen character out of the background frame. I don't know what to do now. Help would be much appreciated