...Your raid is not clever at all bro.
Have some DPS that can taunt maintain 2nd and 3rd aggro on Jorn. Then they get frozen, and Sorno tank picks up boss. If DPS cant kill probes fast enough then I don't know what to tell you except it's tuned to do this encounter with 4 healers and your DPS in columi gear (that's how we did it first time).
This is one of the best fights in the game, I think. Lots of fun