Hm, having the deaths of Yoda, Vader and the Emperor, is a closing of the old order (republic/Jedi/Sith), Luke being the new generation and beginning with his sister ...

Fett should either be not in the movie at all or have a similar role he had in ESB - as one suggested, he could give the plans/information to the rebel spies ;-)

the Jabba rollercoaster is a thing to reconsider - from start to end - yeah, some don't want to change "important" events, but some pointed out, we need "things that matter" ...