If you really do have an overdeveloped chest and underdeveloped shoulders, then I would drop bench completely. Rather than bench, I would do only dips and only once a week. And on the other days when you would normally bench, do overhead presses of some sort instead, preferrably clean and press, push press or military press, or do two of one of those, alternated. You could also do something like high pulls or upright rows to get some extra shoulder work in. Just watch your shoulders for any pain in the joints.
How's your back and legs? You didn't mention. You can't ever have too thick of a back though, in my opinion...
Here is what I would do, if I were you:
Mon/Fri
Deadlifts
Weighted Chinups
Military Press
Skull Crushers or Pushdowns or some other tricep exercise
Wed
Squats
Weighted Dips
Bentover Rows
Push Press or Clean and Press
Each exercise should be done for 30 reps. So 2x15, 3x10, and 6x5. When you get into the 5s, you may have to drop volume, especially in the second week of 5s. Try to maintain at least 20 reps in each exercise during the later part of the 5s (i.e. 4 sets of 5) and you could even go into clustering or max-stim to keep your reps.
I'd only do this for a few cycles. It's possible that dips once a week will be enough for chest to make it grow for you, but I'm counting on it being enough for maintenance, so that you can get your other body parts to grow while keeping your chest where it is at. Of course, with your back and lats growing, your chest measurement will still go up, but it won't be from more pec size, hopefully.
You may need to insert more leg work though if your legs don't grow easily...