Out of curiosity, where'd you get this list?
Also the posterior head of the deltoid.
Also pull-ups and other variations. These also hit the posterior head of the deltoid.
A good exercise, but you could almost as easily substitute the bench press or vice versa. If you're limiting your exercise selection this much, you should (as other posters have noted) choose the military press. It works all three heads of the delts, the triceps, as well as the chest and back in a supporting role.
Note that these last two are where you should put the lion's share of your effort as they stimulate much larger muscle groups. Weight training is both systemic and localized. That is to say, if you stimulate a response by lifting heavy and compound, your body will grow muscle everywhere due to the hormonal and metabolic changes that occur. In other words, squat to make your biceps grow.
The rear delts are still involved to some degree.
Yes. It sounds like your overdevelopment has been due to concentrating too hard on benches and dips to me. Overhead presses, VARIOUS chins and VARIOUS rows are the solution, as well as heavy freakin' deadlifts.
Not unless you want to call a money exercise like the military press an "assistance exercise".
Hope this helps.
Dan "money exercise" McVicker