13 year old 600cc implant exchange! Desiring to go much smaller - Is it possible to go smaller than 450cc?

I’ve had 600cc smooth, high-profile implants under the muscle for 13 years. Due to a rupture, I’m planning a revision. One surgeon recommended going down to 450 or 480cc Mentor Boost implants (moderate profile), placed dual plane. They said my chest is petite, my current implants are too wide, and suggested a width around 13–13.5 cm. I’m 5’6”, 145lbs, athletic build, and very active—hoping to go smaller, ideally closer to a C cup. 450/480cc still feels big to me. My breast tissue is in great shape, and I likely don’t need a lift. Is it possible to go smaller than 450cc? I’d like to revisit this with the first surgeon I met (we didn’t discuss size), but he’s booked for months and I need to move forward soon. I’ve also looked into internal mesh bras but am hesitant due to the cancer risks linked to textured material. Would love any input about what a realistic size reduction is.