Not to be a smart ass, but I didn't realize that there were so many heads of the peck....inner, outer, major, minor, etc...From basic anatomy, there is a clavicular portion of pec major and a sternal portion and then pec minor that is deep to pec major. I rarely do flat bench work..all incline, but it still works the sternal portion of my pec....I guess you could say that I'm a power body builder in that I want to avoid all show and no go. "Isolation" movements may make everything look good or "shape" as you call it, but they really have little carry over to being able to use the nice shapely muscle.