The problem with boob plate is how it deflects attacks. There are plenty of places on that armor where a spear jab would deflect upwards toward the neck area.

Flat isn’t really what you want either for these. When the weapon deflects and slides off to a side, that steals a lot of the energy from the impact. If the weapon strikes a flat armor, it would be much more likely to damage the armor. That might mean caving in the plate, or fully piercing it. Neither is great. (And even if the armor withstands the hit, it might knock you on your ass, which could very well be a death sentence)

There’s usually some room in these sorts of armors. unless you’re tiddy is comically big, I’m skeptical that you’d need a great deal of accommodation. But even if you do, the armor shouldn’t look like booba from the outside.

Something like this should presumably work, but I’ll admit I’ve never had boobs inside of a suit of armor.

I think the positioning of the wings is more towards the center of mass for a humanoid with heavy legs

3. I know butt wings are a thing in some Japanese works, it’s mostly for fanservice as best I can tell. I don’t know where or when the concept originated.