I have 375cc silicone implants and they are too big. What's the right amount to go down in implant size? 275?

I agree that based upon your height and weight that a 375 cc implant must look quite large.  I also agree that a 275 cc implant would likely be much more proportional.  The one thing that you need to be aware of is that as you downsize you may be left with extra skin which may necessitate a mastopexy (breast lift.)  Best of luck!

If you decreased your implant size 100 cc then you will see a difference but you may need a lift additionally because you skin and breast tissue has beens stretched from the larger implants.  Consultation and exam are recommended.

Thank you for the question and pictures.  In regards to specific size/profile of breast implants, despite good intentions, online consultants will not be able to provide you  with  meaningful specific advice.  Ultimately, careful measurements, dimensional planning, and careful communication will be key.  Generally speaking, the best online advice I can give to ladies who are considering  revisionary breast augmentation surgery (regarding breast implant size/profile selection) is:1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.  2.  Again, have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining which operation and/or breast implant size/type/profile will most likely help achieve your goals.In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or "full B cup" or "porn star" etc means different things to different people and therefore prove unhelpful. Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup  size may also be inaccurate.   3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery.  The use of temporary intraoperative sizers, viewing the patient's breasts in the upright and supine position, are very helpful during the breast implant selection process.I hope this, and the attached link (dedicated to  revisionary breast surgery concerns), help.