Adding banded tension to your shoulder work is guaranteed to trigger new hypertrophy gains. Just grab a couple of resistance bands and wedge them under the bench for overhead dumbbell presses.
The key is to lift the dumbbells all the way up to the top and hold them there for a couple of seconds in the contracted position of each rep.
Christian Thibaudeau's transformation from dud to stud put him on the map. Looking back, he'd do things a whole lot differently and a whole lot better. Check it out.