Don't let your insurance company dictate what procedure would be best for you. I know we all want our insurance to cover our needs, but it sounds like a moderate reduction would serve you best. To remove excess natural tissue and place implants just to satisfy your insurance company would be ridiculous.
Have your Plastic Surgeon do the correct removal and leave you the right size that will eliminate your symptoms. If this leaves you at a C as you desire, great. Submit the bill as normal to the company and see what happens. If they deny your claim, have your doctor submit a challenge letter. If that doesn't work, submit a complaint letter the Insurance Commission for your state. Be specific and you will find the insurance company will come around.
Good luck and do what is right for you.
