Static shoulder girdle posture is primarily a learned phenomenon, not necessarily a result of an "imbalanced" program. Stronger muscles are not necessarily shorter muscles. Many folks who sit for a living (computer users, students, desk work) will develop this posture as a result of spending a lot of time in such posture.
Many trainers will tell you to stretch the internal rotators (pecs, lats, subscapularis, teres major) and strengthen the external rotators (teres minor, infraspinatus) and scapular retractors/depressors (mid/low trap, rhomboids). For some this may help if there are true flexibility issues and weakness in those areas due to what's been called an "upper crossed syndrome". You be hard pressed to find a lot of direct evidence that this will help.
The biggest issue you have is to learn a more optimal posture and correct into that posture more frequently. Sort of breaking the cycle of "bad" postures.
To correct, sit up as tall as possible with arms at your sides. Turn you palms forward, pull your shoulders back and down. That's your correction. Do it every time you look at your watch or a clock.
As far as you workouts are concerned, learn proper exercise technique. Prioritize pulling exercises over pushing. Reinforce your postural correction after each set.
Hope that helps.
Bill Hartman, HARTMAN Certified
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