You honestly need it. You're running 4 healers, but basically getting 3 due to the lack of output that you're getting. You have healers that are standing around not doing anything for periods of the fight. Sub 90% activity is unheard of. You have healers that are dpsing, yet there is the issue of tanks not getting enough healing. One of your shamans seems to do that every fight. I always encourage healer dps, but if you forget that you're a healer first, then you should be replaced with either a real healer or a real dps.