^Sorry, I really couldn't resist it.
Ok, here's the problem. Fat storage at the lower chest and midsection is common among men. Not everyone stores fat evenly throughout the body and this is dependant on genetics and, as was mentioned above, your homornal profile. It may give the illusion of an overdeveloped "lower chest". But really, your entire chest is just small.
An overdeveloped lower chest has nothing to do with a powerlifting style, or even regular style bench, unless you are not getting sufficent incline work done. What happens for some, however, is your chest ends up developing less proportionately than your triceps and front delts due to dominance in these muscles. This seems to be the problem for you.
You can try doing more dumbbell work and lowering your bodyfat levels.