Nice post! Definitely lots of helpful info here. I'm a piano player too, I actually recently put up a video of this very piece! Some of the stuff you talk about I also do when I practice, but then there's other stuff that I haven't tried, but makes sense and seems like a good idea. You should check out/use the #classical-music tag - the classical community here on Steemit!
RE: How to practice playing the piano; The deep learning way