5'9", 100 kg, trans woman - Is a 600cc moderate plus implant the right choice for my frame?

I'm a trans woman planning breast augmentation. I'm 5'9", around 100 kg, with a broad chest and roughly a 40-inch underbust, currently about an A to B cup. My surgeon has shown me three Mentor silicone options on a 3D simulation, all placed over the muscle (subglandular) and all on the same base width: a 470cc moderate classic, a 600cc moderate plus, and a 750cc high profile. He has recommended the 600cc moderate plus. My goal is a natural, gently sloping look rather than a high, round, heavily projected upper pole — but because my frame and chest are large, I'm concerned that going too small won't look proportional or won't show enough on my body. So I feel caught between wanting something natural and wanting enough volume to suit my frame. For a body and chest like mine, is 600cc moderate plus a sensible middle choice to balance those two goals, or would you lean smaller or larger? Since all three share the same base width, how much difference in projection and upper-pole fullness should I expect between the moderate classic, moderate plus, and high profile? And does the over-the-muscle placement change what you'd advise?