Chewtobacca said:

Back on topic: I agree that Vader's scream should be put back to its original form.

I'm currently working over the 1980 mix and noticed the "Arrrhhhh" sounds like if Vader had no mask. It even almost sounds like a Ben Burt tinkering with sound.

Not only the "ommhhh" from the special edition sounds like Vader through his mask, but in addition you really recognize James Earl Jones voice what is not the case of the old one.

I think your use to return to the original sources (which I have myself) may alter your judgement about this.