Personally I haven't noticed any difference from before.
Why do you split the DPS? Why not just have a tank interrupt a droid each, and send the 4 DPS on their "own" droid? Surely 4 DPS can handle interrupts between them, and the debuff synergy means that stacking DPS on 1 target is more effective.
Obviously you have not done EC HM 8M since 1.4, 1 person alone CAN'T interrupt, and once the droids get up to 8 stacks they become inmune