If you wish to focus on the lateral delt head than there is the pre-exhaust system. Like doing strict lateral raises followed, without rest, with the PBN. Also middle range reps (down a little below ears and never higher the 2 or 3 inches before lockout) when doing PBN's only. Fast reps and keeping the tension (TUT) throughout the set is the idea. Three or 4 sets of 7-10 reps.
Try Arnold (idea from Gironda DB presses) presses while seated. Different version are "W" & Cuban presses. The DB side press (one arm at a time...fingers facing forward and keeping the elbow/DB inline with the shoulders) is a great delt builder. If I could only do one shoulder exercise than that would be it. DB side laterals while lying sideways on an incline bench or even on a flat bench work well. Even cheating DB raises can add mass. Every rep is in the cheat form, not just the last 1 or 2 reps of a set. In any event, shoulder workouts should start with stretches and warm-up. Senseless not too.
Might also search for complete Vince Gironda training methods. Guy's who worked at his gym all seemed to have exceptional wide and fully developed delts. And a impressive delt/pec tie in. Wide up-right rows and Gironda presses are just a few. Seemed to favor the 8X8 method, in most cases.
Do not need a lot of shoulder exercises in any workout. One pressing and one form of a lateral raise (extension exercise). Three to 4 sets of each should be more than enough, with a rep range between 7 to 10. As Wes suggest, higher reps (from 15 to 20) can yield positive results for some. A personal view is that delts, chest and triceps should always be worked together. They are a unit and should be trained as a unit. Good luck.
Side Bar: Though not mentioned, machines or cables can also have strong role in building delt size. In my mind the Nautilus shoulder machine was way ahead of it's time. The 3 geared cam and leverage was exceptional. There are versions in some medical rehab centers. If you gym has one, than give it a try. Even over conventional BB's & DB's. You will be blessed if you gym also has an original designed Nautilus pullover machine.