Today me and my guild wiped for several hours on freya with one keeper up. The thing that wiped us was the phase 2 small root bombs that makes ur have to move all the time and it reduce the raid dps magnifically. So we scratched our head and wondered what we should do about it.
Our raid leader decided to try to make all of group to stay right behind the boss so that we could move easily when freya did those bombs. So we pulled freya and got to phase 2 all gathered up right behind Freya and to all our surprise Freya did not even cast the bombs!
This made phase 2 really easy so if you guild have problems with Freya just tell your raid to gather up behind Freya.