Thank you! These are exactly what I was looking for and more. I'm not expecting rapid progress either, since the main reason I'm not doing lessons is because I can't commit to the practise time required during the academic year. My intonation is still inconsistant, and it's a lot easier to hear and adjust by playing something like scales slowly. I definitely plan on going through the two technique books you recommend (sticking to 2 octaves), and work on the 170 foundational studies slowly when I have time.