I'm not sure what's going on. Our tanks die, then raid dies(i usually fd

).. It's usually the OT that dies from the pounding that hes getting from adds and uthtak. Does the DPS the encounter go up with the more DPS the raid does or something? thats the only thing i can think of...
We were running 7 healers at first.. even brought in an 8th healer for last couple pulls. still wiped continuously.