We did this last night on 8-player hard mode without much issue. The patch will make it easier, but it does look like the added coordination check will remain. Ideally, you want to throw all your dps on one droid to get it down fast, and putting your tanks on one droid each. When the first droid dies the other two should be at 2 or 3 stacks at most. You then put players in a 3 interrupt rotation and you can get -every- cast. The way it worked pre-patch it allowed for several errors. Now there's even more room for error. So this shouldn't be a problem.
As for the flawed mechanic thing, they probably meant for the fight to be like this all along but couldn't do it til commandos got an interrupt. That's smart.