FWIW, I've played in loud settings, drummer, bass cab, floor wedges ...and my Taylor has never fed back into the system. The ES systems are the most feedback-resistant systems I have ever personally experienced ...one of the very reasons I prefer the ES to everything else as it is not for pure tonal considerations but an all-in-sum decision that I love the ES.
By contrast, I've had to use a sound plug on an old Ovation ...a stellar stage guitar but still would feedback, nevertheless. Pros on a big stage use sound-hole plugs even on their ES guits (I can thaink of Dave Mattews, for example), because their stage volume is
far beyond what this hack will ever see. Unless you're a pro act on a loud stage, I seriously doubt you'll need any feedback "busting" when running an ES properly EQ'd ..heck, even dead-flat EQ you'd be fine

Edward