Hm, I'm not sure where that extra padding could be to really enhance protection. Inside the cups? That would do nothing to help the pressure from the rims. Because that's the problem - the shape doesn't diffuse the force, but concentrates it instead. A layer of padding wouldn't really fix that.
Hm. Maybe I'm just dumb, but I still don't get the 'amplification of impulse due to smaller pressure area' argument.
If I remember my physics correctly, pushing two more or less parallel surfaces together yields a uniform increase in pressure across the whole area in between the parallels. If both surfaces have an identical depression or a bulge, say in the middle, the increase in pressure there is just as high as the increase in pressure in the surrounding areas.
Now if the surfaces are not parallel, then we have indeed the problem of pressure points. But wouldn't the conclusion be that as long as
- the armor is well-fitted
- the armor material is inflexible
- the material thickness is uniform
- and we leave out the possibility of armor being compromised due to weapons being caught in an ornament or the likes
boob armor actually IMPROVES the comfort of its wearer in combat? Because if the boobs form a bulge in the lower layer and the upper layer, the armor, does not accomodate these bulges, the pressure points will be directly over the boobs, so a hit on the breastplate anywhere is going to squeeze the boobs more because the surrounding areas (the rest of the torso) will catch the impulse far later than the boobs.
WTB physicist.
Edit: This is indeed getting hilarious. I'm having great fun with applied physics 
Edit 2: This is also where I'm getting painfully aware that English is not my mother tongue and that I didn't have maths/physics classes in English. So apologies if I'm not as clear as I would want to be, I'm really treading thin ice here with maths/physics terms.