Well, if that avatar is you I would say we may need a new word. None of those seem to apply. We need a new expression. . .a road sign comes to mind:
If you were in Ohio, I would do a session with you and see if I could do some wordsmithing after what I am sure would be an inspirational time.
Until we arrive at a better expression. . .
Go with curvaceous.
It just sounds better (and is more correct than curvey) and as you mentioned some of the other words slip into BBW ranges.
As a side note it is funny that the word voluptous has come to mostly represent the description of a woman's figure when if you go back to the Latin it is really about attitude and demeanor. Of course that can go hand and hand. . .
Voluptuous really means sensuous and sleazy, and proud of it.
Here is a little tutorial if it helps:
Sensuous implies gratification of the senses for the sake of aesthetic pleasure, or delight in the color, sound, or form of something (: a dress made from a soft, sensuous fabric).
Luxurious implies indulgence in sensuous pleasures, especially those that induce a feeling of physical comfort or satisfaction (: a luxurious satin coverlet), while epicurean refers to taking delight in the pleasures of eating and drinking (: the epicurean life of a king and his courtiers).
To be
voluptuous is to give oneself up to the pleasures of the senses (: the symphony is voluptuous in its scoring), but it carries a suggestion of physical pleasure and over time has come to refer to a curvaceous and sexually attractive woman, but that is a deviation of the actual meaning (: he was seen with a voluptuous blonde).
Sybaritic implies an overrefined luxuriousness, also suggesting indulgence in good food and drink and the presence of things designed to soothe and charm the senses (: he lived alone, in sybaritic splendor).
I apologize for being a nerd, but words are important to me.