I've found that the rides can get slogged up in the afternoon, right when the crowds peak. Your daughters can get to the park early and grab a fast pass to one of the big rides before running off to POTC or HM. Then, do the fast pass ride before rejoining their dance troupe.
As they are dancing, grab fast passes for them as soon as the system allows a new distribution so they can get on other rides quickly, between sets. And the CMs most always let guests use a late fast pass; which is basically arriving at the ride after the fast pass window of time has expired. Using several current and late passes could help your girls get through a series of rides pretty quickly. I've used late passes without problems, though I try to return within a few hours of the expiration.
One last thing: I'm sure you've heard of long lines at Peter Pan's Flight, Dumbo and Nemo, but also beware of Astro Orbiters. The line may not "look" long, but it moves extremely slow.