What procedure can move breast farther apart? (Photo)

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.

Thanks for the picture. In my opinion, if your breast are naturally close together then there's nothing you can do to alter that. Please seek recommendation from your operating surgeon. 

I think that you have a nice result. Your breasts look quite large and I am not sure what you are trying to achieve by trying ot have them positioned further apart.