Most people have trouble feeling upper chest...the key is to build overall mass and you will end up with a bigger upper chest. Isolating the upper chest entirely is kind of impossible without also hitting the bulk of the chest....so I would suggest learning how to bench correctly...ie look on youtube Dave Tate bench press and get your weight up to where you are repping with over 315lbs. Get in your benches, inclines, flyes etc and concentrate on getting stronger and you will grow. As Ronnie used to say..."everybody wants to be a bodybuilder, but nobody wants to lift no heavy ass weight!"

P