All those bits could have worked better in different contexts.
The meditation chamber bit should be on The Executor (with a new establishing FX shot) before Vader arrives at the Death Star (which should dwarf it).
The lift section should be before meeting Palpatine later in the film.
I don't think it hurts that much seeing the saber built but personally I would have had it built on Dagobah not Tatooine and have Yoda die in the beginning of the film (after completing Luke's Jedi training as best as he could) rather than just waiting for Luke to return and dropping down dead in the middle of his reunion conversation.
Only ANH starts with a bang.
Having ROTJ start with a carry over of the mood of ESB wouldn't have hurt the film in my opinion.
ESB starts rather slowly and starting this film with Luke telepathically pulled to his biological father while losing his last mentor would have bridged the downbeat ending of the previous chapter with the action sequences to come rescuing Han.
Having these little bits crunched together seems a little Forced (pun intended).