Does this really look like 350 cc silicone implants? (Photo)

Your implants are sitting high on the chest wall. Often surgeons use stitches at the inframammary fold to ensure that the implants dont drop and cause a problem later on called bottoming out.  These stitches can be permanent or dissolvable. Dissolvable stitches usually cause relaxation and drop of the implant between 1-2 months. The control of the inframammary fold with stitches can cause implants to sit high initially. Almost always breast implants drop and your implant volume is currently sitting in the upper pole rather than in the lower pole. When the implant drops you will hopefully achieve the result you are looking for. You may wish to see your PS and explain your concerns and gain further reassurance.  

The fact that your breast implants have not dropped down beneath your nipple areola  is making them look high and small.  I do not doubt that you have 350 cc breast implants is just that they are not in the proper position.Typically I would wait 3-4 months to allow the implants to drop, I would encourage displacement exercises, and I would have you wearing a superior pole wrap in an attempt to force the implants down.   If after 3-4 months the implants are still high a simple release procedure could be done to drop them.