Interesting topic, which has come up at my school ... my teacher recommends listening to lots of recordings of stuff that you are playing, while one of the other teachers is adamant that it's a betrayal of artistic integrity to listen to anyone else play something which you're currently working on. That's a strange view, in my opinion - perilously close to arguing that
having a teacher (at least one who will be artistically useful, rather than just a technical advisor) is a cop-out.
I don't know at what stage of learning you are at. However, most mature pianists are not interested in other's interpretations. Isn't there a risk you will end up with a patchwork interpretation made up of bits of other people's interpretations?
Not for nothing did Richter listen to Michelangeli when he was learning the Paganini variations... not for nothing did Horowitz play the Benediction for the mature Halim... and to my knowledge, no Horowitz student has become a Horowitz clone - look at Janis. etc, etc. Also see some of Bernard's posts on recordings (I can't be bothered to dig them out right now, but one thread is called something like "Should we listen to recordings?")
Not for nothing are the concerts of the greatest artists filled by pianists of all levels ...
Personally, I think the most dangerous thing is absorbing phrasing. This isn't really a big problem unless you only listen to one recording a lot, or deliberately try to copy the rubato (I mean the rhythmic shape of a phrase, not, for example, one particular slowing down) of another artist. This is like trying to copy someone's breathing, or their speech. I think it can result in an artificial, unnatural sound. What we SHOULD listen for is the
overall naturalness of the great masters' phrasing. Then recordings cease to be creative "blocks" or "hindrances" but instead sources of inspiration. Other than this problem, I'm all in favour of listening to recordings - as many good ones as possible. My teacher says there is something to be learned from bad recordings, too. What is the artist doing wrong?
In some cases, an artist's unique flash of insight can introduce creativity into one's playing. I think this is especially true for composers such as Liszt. Example: Cziffra's Liszt is filled with countless inspirations, like in a passage he will suddenly accent certain notes or use rubato in a uniquely Lisztian fashion. While I don't advocate "copying" what Cziffra does, listening closely to his recordings will certainly improve your arsenal of tools for playing Liszt, even the pieces he hasn't recorded.
And so on.
As to the original question: What you are proposing could be useful - writing down critiques of recordings, especially great ones, is a good exercise, although this could become very time-consuming. You also seem to suggest keeping a "practice log" which I don't do for time/concentration/laziness reasons (possibly a gross stupidity on my part)....
Other than that I can really only suggest the obvious: analysis, and, especially for vocal melodies such as found in Chopin, Schubert, ... singing / conducting the line.
Sorry this post is so long. And that I'm responding to a relatively old thread.