Who is the best surgeon for a breast augmentation revision, specifically for symmastia? (Photo)

Dear Summer111,Many women seek improved cleavage. Narrowing the cleavage plane can be done very carefully by a skilled surgeon. Moving the implants too far medially can result in synmastia or unaboob which is very difficult to correct. That being said, the right amount of pocket dissection and implant selection can create excellent cleavage. Finding the right Dr. is extremely challenging especially with the number of online platforms and resources available. There a lot of great Dr's available. Definitely check to make sure your choice specializes in the procedure you want and spend the time to read through patient testimonials. 
You can always pick up the phone and call around also, find an office you feel comfortable with and set up a few consultations. Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery  
Member, Am. Society of Plastic Surgery

You need to find someone who is versed in repairing this problem, In particular using some of the acellular dermal matirix such as Belladerm or Alloderm. This are complicated cases and you need to find someone who has done many of them.