Left pec smaller than right one

I know that all guys will not have the exact same size pecs. My left
pec is considerably smaller(not as wide) as my right pec. However, i
have tried to do pulley pec exercises and using dumbells with the left
hand at heavier weights(at least 10lbs more) than right hand
dumbells. I have been doing this for a couple of months now. It
doesn't seem to build up my left pec as much to catch up with my right
pec. I do think my right pec has a bigger chest bone than the left or
maybe protrudes more which is probably what i was born with anyway. Is
there a good specific chest workout to at least make the size
descrepancy less noticeable? I have added some pics below. Thanks a
bunch!

http://i5.photobucket.com/albums/y199/inquisitiveman/Picture003-1.jpg
http://i5.photobucket.com/albums/y199/inquisitiveman/Picture004-1.jpg

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