um yeah dude, for the lower pecs dips and weighted dips really work. especially if your looking for some seperation from your lower pecs and your upper abdominals. i found weighted dips more enjoyable then a decline bench press/flys anyway. good luck.
This topic has come up before.
this is what Evo wrote
"It's not necessarily the angle that you hit the pecs at that will have the most impact but the force of contraction. I know this has been mentioned but try and concentate on the static contraction at the lockout and a slower eccentric.
I think some cable flyes over db flyes and 1 arm db pressing will help with what you are looking for."
incline bench press will only work across the top of your pecs resulting in a sloped look. try incline flies and dont use no pussey weights, lift as much as your pecs and arms allow
incline bench works the pec at a different angle, and thus exerts a different type of stress on the muscle.
but since the pec only has one muscle head, it can't be worked 'across the top' or 'at the bottom' like you think.