To target the upper chest I would not suggest using a steep incline. The greater the incline, the more you will shift overload away from the chest and direct it to the front delts.
I recommend starting your chest workout with 3 sets of an incline movement, bar or dumbbell and keep the angle of the incline at about 25-30 degrees.
Next, I would do 2 sets of flat bench and finish with 2 sets of dips or decline presses, all in a 4-6 rep range. This is a great combination of exercises that will give extra emphasis to the upper chest while effectively working the other areas of your chest as well.
Remember, more volume is not the answer. Overload and intensity are the key to building muscle.
