I held something in front of my mouth so it sounds like I'd be wearing a mask, it made the sound a bit softer(?), then compress it to hell, like 12:1 with attack and release at the minimum with threshold at like -15 so it gets distorted a bit already. I pitch shifted it just enough so I wouldn't sound weird. Now I just added some warm distortion and EQ'd the whole thing. I tried a really quick replication of it to show how it may sound, if I'll find more time I'll try to work on it properly. https://clyp.it/qg3n4yb1 I'm not saying you've done a bad job or you're not competent, I'm saying you may have a wrong idea as it definitely doesn't sound as distorted in the movie. And I think that's the issue, the key is to make a close impression of his voice, I know the problem, cause I've been trying to process my voice actor's voice into Vader and I made the same mistake with putting too much into it instead of trying to record it in a different way