i like the sound of that strat bae.  one thing i would like to suggest is use raid warning or something to put up on the screen who is being marked. because as i was sitting back and healing, i was focusing on the groups and not finding myself paying as close of attention to the chat log.   also with that strategy i think use shammies could help by dropping the earthbind totems right by where the offtanks stand to slow them down, and also temblors great idea of magma 1 totem right there too which will take the panthers out of stealth and be easier to pick up.  another thing i heard from a buddy of mine on another server is that the marked targets need to kite the panthers pulling them away from the raid as a whole and thats where the frost novas help.  just a couple ideas for ya... fuzzy out