After warming up, 3-4 intense sets to failure is enough, in the moderate rep range 6-12. That's it, don't do more in terms of presses, just focus on improving weight/reps on that. Simple, but demanding you have to push the envelope to continue to improve on that then you'll see both strength and size improvement. Forget the singles and doubles that's powerlifting.
And of course throw in some laterals or whatever works too, and ensure the diet is sufficent to help with "good" bodyweight gain that's needed for size increase.