Pull over presses.
Use an EZ bar like you are doing close grip benches with it (actually you are), lower the bar to your chest and press it up about 2 inches, keeping your elbows still bent dip the weight backward over your head like you are doing a very lazy pullover, this provides the stretch... then bring the bar back around to your chest and press upwards. Try ten reps and see if you don't scream.