DarkFather said:
I suggest editing out a chunk of the Emperor's dialogue. As presented in ROTJ, he's a very stock villain. When you imagine him sitting there, most the time silent, you can feel the tension building up. So when he does speak, his words could that much more weight. I also suggest having him speak more slowly and collectively, as the character did in Empire Strikes Back.
Silence among contrasting characters, when done correctly, is a superb way of creating a foreboding tension. The way it is in ROTJ now, is very scripted and watered down.
Consider this.
I actually like the idea of Palpatine being a smarmy git, the way Ian delivers lines like "Oh, I'm afraid the deflector shield will still be operational when your friends arrive" cracks me up everytime.
In a way Palpatine is Yoda's distorted reflection.
Yoda delivers wacked out humour but still manages to sound mystically good, Palps delivers wacked out humour but still manages to sound mystically evil, both hide their great power behind the mask of ancient frail looking bodies.
If the Clive Revill Palpatine had survived through to ROTJ I feel we would have missed out on one of the better performances in the whole saga (he certainly makes the prequels more watchable), though I liked the spooky look of the original Emperor more.