18 months post-op with medial tenting after 550cc implants. Can this be fixed without significantly downsizing? (Photos)

I’m 5’3”, 150 lb, 18 months post-op with 550 cc Mentor MemoryGel Moderate Plus implants under the muscle. My pre-op breast base width was about 14 cm, and my implants are about 14.6–14.7 cm wide. Since surgery, I’ve had persistent tenting/webbing of the skin between my breasts over the sternum. It affects how my cleavage looks and has become a significant source of distress for me. I otherwise really like my augmentation, especially the size, width, fullness, and how well my breasts fill my chest. My biggest concern is whether correcting the medial tenting would require me to significantly downsize. I would strongly prefer to keep approximately my current breast volume and footprint if possible. Does this look consistent with medial pocket malposition/symmastia or another type of webbing? What are the likely causes? Could this potentially be repaired while keeping me around my current size, perhaps with pocket reconstruction and/or different implant dimensions or profile?