MTHaslett makes some very good points about Vader's personality in ROTJ. Between ESB and ROTJ, Vader has had a radical change of perspective, and he's switched from overthrowing his master to blind obedience.
If there's a way to edit this so Vader appears stronger and more consistent, I'm all for that. But it's such a prevalent feature of the movie that I'm not too positive it could be pulled off.
And Possessed, cropping the matte painting to focus on the ships would be perfect, as long as the resolution holds up.