a while back, i tried something different with cable flyes that helped bring my pecs together, but it might not work for everyone. instead of stopping the flye motion when my hands met in front of my body, i continued the motion so that my arms crossed over eachother. so i ended up with my right hand by left hip and by left hand by my right hip.
IMO the reason why it worked for me is because its simply a fuller range of motion than stopping the flye when your hands meet.
like i said, it worked for me, but may not work for everyone else, just give it a try and see what u think