HP projects more, but the base is smaller, UHP projects even more but again even smaller base, therefore less side boob. Mods are often used on say someone with a wider back as they need a larger base or to try and create the illusion of closing the gap, to get more of a cleavage, generally get more side boob but depends on your frame. Mod + is between the two.
I’m pretty much exactly the same stats as you, I had HP 375cc and 400cc from 32B xx