Actually, since the most recent patch, this strategy doesn't really work anymore. My group used to do this (and we've cleared HM FE multiple times) and get the result you describe, but we tried it yesterday and it absolutely did not work. We could not get that ship to back off, no matter what combination of turrets we used.

My biggest problem with the new cooldown UI is that when I pop an ability, everything else kind of . . . I guess "whites out" is the best way to describe it, which makes it very difficult for me to see what's getting ready to come off of cooldown until just before the GCD is up. I think it's more of an annoyance than anything else, but I'd like to be able to plan what my next ability is going to be more than .5 seconds before I'm going to need to press the button. Edit: Naroga's post upthread (which appears to have been repeatedly quoted) gives a perfect description of this.

Let's talk about SCORPIO: She looks like the Joan Rivers droid from Spaceballs. We need alternate appearances, ASAP. That is all.