As a general rule it takes about 100 -150 cc to make a visible difference in cup size. Your increase to 350 cc should be right on what you need.
Remove and replace breast implant procedures are very common. A good rule of thumb when increasing breast implant size is; to make a noticeable difference a minimum of 50% increase in breast implant volume is needed.So, in this situation, the original implant size is 235 cc, 50% of 235 is 117.5, 235 + 117.5 = 352.5 cc. You are right on the mark! Go for it!!!Good Luck!