Will 100-130cc increase give me the look I want? (photos)

I might consider going 450 to 500 cc's just be be sure you achieve a size you desire. Always best to in person discuss this issue..

Larger implants will get you more cleavage but will cause more issues long term. Implants were never invented to create cleavage in someone with your anatomy. I think the picture with clothes on looks great and you have a nice size implant. That being said big implants may make you more happy but with a trade off of consequences

Implants are designed to add volume to the breasts, not change the shape of the breasts.  The gap between your breasts is a function of the width of your chest bone.  If you tap on that area, you will find that it is basically a bone covered by a thin layer of skin.  Because of that, I tend to discourage patients from trying to do too much in that area.  Several bad things can happen.  First, the pockets could connect across your chest, a condition called symmastia.  This would require a second surgery to correct.  Second, because there is so little coverage over the implants in the cleavage area, any little ripple or wrinkle will be more noticeable here.  Finally, if the implants are centered too far towards the middle rather than behind the nipple, the nipples may point in opposite directions.  I have seen many patients come through my office over the years with problems from someone trying to surgically give them more cleavage.  As for issues regarding the right volume implants to use, this is something that should be discussed in person with a plastic surgeon who can examine you as well as discuss your goals.  It's not like putting bumpers on Chevrolets!  Each patient is an individual and must be treated as such.