Should I get ​350 or 370cc gummy bear implants?

This question of sizing is always one of my patients' top concerns.  And deservedly so.  Having said that, I agree that 350-370 cc is not a big difference.  I size our patients with 3D imaging as well as the use of sizers (directly on the chest, not in a bra).  Re-visit this issue with your surgeon and best of luck with your choice!

Thank you for the question. There is no accurate correlation between size of breast implant and cup size achieved.
Generally speaking, the best online advice I can give to ladies who are considering  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're looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  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 "C or D cup” or "stripper boobs"  etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup  size may also be inaccurate.
 The use of computer imaging technology may also be very helpful during this communication process.
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.
I hope this (and the attached link) help.

My thought is that you need to return to your surgeons office and re size the different options. In the end, it doesn't matter what your doc thinks look good on you, it only matters that you like your look. And, a 425cc implant on a 5'8" 122lb woman will be a lot of breast. You need to re size and make your own choice. If you surgeon disagrees get a second opinion.