You're opening a can of worms here. One thing to keep in mind is that composers often made revisions on their compositions, so the concept that any one version is the absolute representation of the composer's intention is futile. The only way we could get a grasp on a composer's intention is to have them here alive and tell us how they wanted it to go. As for research, I doubt your local library will have much on this kind of subject, and in fact, I doubt most university libraries would contain that much material on this kind of subject. You may luck out in finding the occasional article in a journal which deals with these kind of issues with editions. The Henle are fairly reliable, and usually they include an appendix which point out discrepencies between extant versions of the work. I don't think your teacher's suggestion is a bad one. If you have different editions available to you then compare them and decide for youself which sounds best. I think with Chopin in particular you can't treat the score as something written in stone. If you do your performance will lack originality. Just my opinion FWIW.
I think there are some interesting books/articles on Chopin performance practice that you may find interesting to look into. There are a lot of issues including the whole conundrum regarding the use of rubato. Of course scholars do not agree, but its worth an investigation.
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