The method (pre-Surgical Probe) that works best for me is:
Kolto Injection on tank
Burn Tactical Advantage immediately by popping Stim Boost
If the tank is taking massive damage, use Kolto Injection as needed until you have time to lay 2 Kolto Probes on him/her
Then you simply keep Stim boost up whenever possible, keep double Kolto Probes on the tank, and on other party members as needed, and watch to see if any DPS'ers snag aggro and need aid.
This usually gives me ample energy and opportunity to keep Corrosive Dart on at least one target, and periodic standard rifle attacks. When the pack of enemies is down to the last mob, I usually can double Kolto Probe the tank for the last time, walk in and Backstab/Shiv/Overload Shot from behind.