Firstly, please realise that I have no concern with you playing however you wish to play.
However, this isn't about your playing, it is to do with understanding motion and how it effects playing and how the instruction related to motion will effect your students playing.
- Explain why your motion is different and/or the same to fink's suggestions.
- Test your idea against fink's and explain why his or yours is the better idea.
- Consider that as a teacher you have an obligation to look after your students best interests by teaching only the best ideas you have at your disposal.
The etude has been in your repetoire since 2007 based on age of the video - As a teacher, with a performance diploma and a Bmus you should be able to play it technically as well as pollini/lisitsa/horowitz or any other noteable pianist by now. If you are unable to execute a piece that has been in your repertoire that long FLAWLESSLY then you have got a technical problem that you are obviously unaware of and have no idea how to fix.
If you think that I'm being disrespectful of 'genius' in saying that you should be able to play aswell as those names, fine. But as a teacher you should be doing EVERYTHING possible to ensure you know (and your students know) how to get to world class standard, and dismissing the teaching of good motion on the premise that if a certain coordination gets you through the notes its good enough, is a clear violation of that duty as a teacher.
If your technique was built from the very start on good principals of motion you would not be having the performance difficulties visible not only in the video of this chopin etude but in numerous other pieces I've seen scanning through your youtube channel.
Don't give your students (or forum members) such pointed technical advice as if to say that there is no possible way for you to be wrong unless you are infact ABSOLUTELY certain that you have the best possible correct idea (consider that your e minor prelude is fairly conflicted with fink's thoughts?!?!), if you turn out to be wrong, you will have been paid to damage your students progress (this is just totally immoral).
Even if your ideas about technique are based in a logic that makes sense to you, and you turn out to be successful in 10 years after much practice -
- if you can't play at a world class level given your degree/diploma/teaching experience that should be enough to make you seriously concerned that an idea
MIGHT be wrong, and you should in turn be horrified at the idea of passing wrong ideas on to students.
You should at least be portraying your ideas as "try this, see if it helps" not "this is exactly what you need to do, you'll see progress in a few years" - as you suggested to rach_forever regarding the process of learning to relax properly.