To get cannonball delts I really think that overhead work is required. Like Arnolds, Front militarys, reverse military and so on. I dont do a lot of front delt work w/the logic that that head gets hit pretty good in benchs, inclines etc. So I concentrate more on side ands rear delts. For traps (seperate day) usually upright rows, shrugs and so on.
Sets usually in the 8-10 range as its not a large muscle and gets hit residually w/chest and back