my pecs are the same way, left is bigger. Cant really do anything about it, definately dont work one and not the other. Someone once told me the trick is to get them both huge , so the difference isnt that apparent
Exactly.. Do db press and when your weaker side starts to fail.. Stop even though you could do more with the other. It can take time, but they will even up. This used to be a problem with my left bicep. I did curls but stopped once my left would fail even though I could do another 2-3 with my right.