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Sister of Battle anon here, I know the final result of my entry was a bit of a mess from rushing towards the end there, but with everyone asking how to make bigger boobs for their FAGs I figured I could share this tip
Get a girl figure with big breasts that are very neutral in design and shape. For example I took the chest piece off of my Bright Feather and made some molds of it. It was very simple to just file off the mechanical bits on the sides and voila, a pair of smooth, featureless and much more natural looking large breasts then I could have made on my own that are now perfect for adding additional details to blend into the rest of the armor design.
I was using resin at first, but was spending way too much time sanding down the back to make them fit around the larger figure's chest. So I used greenstuff since I could easily press the chest into the putty while it was setting in the mold.
TLDR: want options for larger breasts for your girls? make molds of larger breasts from other figures.