What can I do about having too much upper pole four years after breast implants? (photo)

I have a lot of upper pole and no lower pole fullness, breast seem to have never dropped, implants are also very small seems to be around a B cup small C. Silicon gel implants done in 2009 when I was 18 yrs old in Mexicali Mexico I am currently 22.I would like to have more fullness at the bottom of breast and more centered nipples, breast implants feel way too firm. Would it be best to try saline? Currently living in Palm Springs CA