I have a very similar problem that I cannot figure out...I have a pain in the same place, but mine only bothers me when I do flat bench....I mean I can feel it a little bit when I do other exercises, but bench is the worst....I went to the doctor and he did some x-rays and said that there is nothing wrong.....I took about three weeks off of chest exercises to see if it would help...it felt better until I did flat bench again, then the pain came back....I have a doctors appt tommorow again....i am going to ask him to do an MRI to see what is wrong.....I will keep you posted when I find out.......