Hi leo89,its a side solution till someone goves you a better one. But you have the very same problems i did, and still do. No gfx, movie or misic iros work.
So i just extracted all gfx from iros that i wanted (you can just dl waifu gfx iros and extract it into mods\Textures folder, it has battle field and world gfx),
as for the movies same, extract all chose the best ones you like and copy them into Data\movies folder (i think? Default 7h settings).
The sound and music, look for ff7music in the forum, its tool that works with 0.7.11b aalis driver, since my old laptop dont support 0.8.11,
thats what aluza suggested to me and it worked, then also extract those mp3 sets you want into Ff7music - custom music folder, activate ff7music.exe and keep it active when playing.
Also set music plugin to ff7music in main 7h settings. Should work, hopefully.
I set it up like that and didn't bother with those iros anymore. It's cheaper on ram and saves space. Just defrag drive after you extract and clean so it doesn't slow down.
Good luck!