stop whining about your bone structure and go lift something. I'm guessing by your terminology "intense delt work" implies a bunch of worthless isolation excercises. Cut out all of the machines and stick to heavy overhead presses, incline bp's, rows and so on. Eat something. Repeat as necessary.
Lifting heavy and eating more will inevitably make you stronger, and eventually, bigger regardless of your genetics, provided the right excercises are selected. There really isn't any magical formula here. Set a day for pressing motions, and go lift. Set a day for pulling motions, and go pull (rows, chinups, etc are excellent for working rear delts). If you aren't squatting, start. Lift as fast as you can while retaining control, try to add weight at every session, eat more, and you'll be surprised with your results. Dick around with
gy exercises, cut carbs, miss workouts, neglect lower body lifts, and enjoy your sunken shoulders. It really is that simple.