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.
Many lifters and coaches grasp the big picture when they read about the movements I prescribe for strength development, but they often miss the finer points. I've written this "Toolbox" series to help these experienced lifters fill in the blanks. It'll also help newer lifters learn about some very effective exercises.