You should have had another choice: "normal bust" ... I would have chosen that in addition to petite or "loli" (which isn't only "flat").
I find small petite women with proportional measurements cute... what I don't find cute are the "boobs bigger than her head" characters in some anime. I think the only fairly well endowed character I liked I can think of was Nerine from Shuffle! -- and even then her bust seemed to vary dramatically depending on the phase of the moon.
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