I'm not going to comment on your technique without seeing you play.Regarding your scales and theoretical knowledge - I would consider including the study of modes and progressions within a key....
You're welcome.Part of Lhevinne's book "Basic Principles of Pianoforte Playing" is online because it appeared in several issues of magazine "The Etude" in 1923 (I got the picture from there; it's in part 2):Part 1Part 2Part 3Paul
As far as technique is concerned, do you have a suggestion on reading material regarding safety and proper technique? I'm sure there are hundreds, but which one would you recommend most?