I've never given the title any deep thought until now. The "Pride" is easy. We are clear up front that a lot of that belongs to Darcy. The "Prejudice", at least to me, takes a little more thought.

My first thought was perhaps JA meant Darcy to be proud and Elizabeth to be prejudiced. Yet, as you say, it appears to affect them both.

I'm currently doing a word search through the book looking for "pride", "proud", and "prejudice". I'm only up into Chapter 12, but "pride" and "proud" are easily found. Not so the word "prejudice". But your remark,

... JA uncovers in each two intertwined levels of consciousness. ...

leads me to think there might be some gold nuggets of deeper understanding to be mined out of this study.

I was struck by the fact that you put "first impressions" within quote marks. The Notes in the book before me start this way:

In 1796, following the start she had made the previous year on the novel that was to become Sense and Sensibility, Jane Austen began work on a novel she was then calling First Impressions. This first version of what later became Pride and Prejudice was read and approved by her sister Cassandra and her friend Martha Lloyd, among others, and Jane Austen's father offered it to a publisher in November 1797, though without success. (Pride and Prejudice, Könemann Verlagsgesellschaft mbH, 1996, p.355)

Thank you for your note. My anticipation is encouraged!