The 3 delt heads get involved in most upper body movements, like bench/inclines, pullup's/pulldowns and even DL's to a lesser extent.. They do not require a lot of extra attention. Keeping it simple (stupid) may be all that is required. If feeling the need for high volume, than knock yourself out. It's your body and training time. But 6 serious sets should be enough for just about anyone.
The only exception, in my view, would be special designed programs like GVT (10X10's). Choose one compound exercise, like overhead presses, to focus on. I, and others, have used the the PBN (press behind neck) also for this one exercise program. Meant to be used anywhere from 4 to 6 weeks, usually twice a week. You have the same weight on the bar the total 10 sets of 10 reps. Easy the first few sets, much harder the last few sets. Try a 60 to 90 second pause between sets. May take a couple of workouts to find the correct weight to use. After that, you will get much improved and much stronger in pressing.
My view only, no big deal: the best shoulder mass builders are push presses. The bar will be resting , more or less, on the heel of the hand and pushed (not pressed) overhead. This lines the heel of the hand is in direct line with the wrist/forearms. Giving a better line of force to be applied (heavy duty bencher's use this style on occasion). With the conventional grip (bar resting on the palms, thumbs wrapped around the bar) there is more stress (injury?) on the wrist and force/power is reduced. A close second best delt mass builder; jerk presses. Either one is best done in a PR. Good Luck.