For what it's worth, I agree and think these conclusions are obvious. The "pride" subtype is almost necessarily coincidental with Proud Beauty
, so it's a natural subtrope. The case where a character is proud of large breasts without being beautiful probably has no examples and can be ignored.
And naturally the exact inverse of a trope must also be a trope when there are more than a few examples. I'd like to see a trope for which that wouldn't be true.