As others have said, Sunday will probably be the busiest of those days. However, is Fantasmic a priority for you? For me, it would be since I love that show. In the slower times, they tend to only run the show Friday-Sunday.
Nah, my only priority really are the two Star Wars rides. I was waiting for RotR to open before visiting, but this boarding group stuff is honestly making me nervous. I'm hoping by the time my trips rolls around, they won't be doing the boarding groups anymore, or at least they won't fill up as quick as they are currently.
Also: would there be likely any difference in crowds between that Monday and Tuesday?