Can you create a wider cleavage gap in a breast augmentation?

This is tricky. Often the cleavage, whether close or wide, stays about the same. A large implant would likely increase the central fullness as you have mentioned. A breast reduction might be considered, with placement of an implant. The closeness of the cleavage will probably be about the same, but you would probably have a more open appearance, without the breasts pushing on each other as much.

Unfortunately, you have not provided photographs. Breast implants have to be centered underneath the nipple-areola complexes. If your breasts are too medial now and you do not like it then implants will not solve your problem. You may need repositioning of the nipple-areola complexes using a donut mastopexy.

Best Wishes,

Gary Horndeski, M.D.