I use WWE but we don't use FLL. However, I heard you can skip the narration and copywork in FLL and use WWE instead.
As far as WA, I didn't use it with my first grader and used WWE instead. This year I plan to use WWE and R&S with her for second grade. I think I am going to start WA when she is a bit older, maybe 3rd or 4th grade, depending on her ability.