I loved the movie, just loved it. One thing I might change is the dialogue between the director and Vader on Mustafar. I would simply cut vader’s line about chocking on one’s ambitions, (he’s a sith for Chrissakes! Ambition is all he knows.)
I hated that line because Darth Vader does not use one-liners. But I don’t understand your point about him being a Sith.
And I hate the idea of putting anything more from ROTS in.