What procedure can move breast farther apart? (Photo)

What a great result! Why mess with this is beyond me??? You need a dose of reality and be happy with this great result... 

You have large implants with large breasts that are nicely shaped.  The closeness of your breasts is largely defined by your anatomy and the shape of your rib cage, and cannot be altered without going to smaller implants.  From your history you have already had Seri placed to help hold your implants in position.  Further surgery is unlikely to give you what you want. You can extend the pocket for the implants laterally, which might move them out somewhat, but then you could have problems with your implants falling laterally or bottoming out.  I would accept your breasts as is.

There is no practical way to create a greater distance between your breasts unless you exchanged you implants for a significantly smaller size. It would be helpful to know what the configuration of your breasts were prior to your augmentation. It is hard to tell by the photographs what degree of asymmetry you currently have. In my opinion if you are satisfied with the size of your breasts and do not want them any smaller you are probably better off not undergoing any type of revisional surgery.