Hi q21q21!

I agree with Justn - don't give up so soon - In fact, don't give up at all!

I may be wrong but the general tenor of your account seems that you are much too anxious to get early results. Such anxiety can seriously hinder the start of the re-wiring process. I think it would help if you dropped all thoughts of jollying your KSMO project along by any other means and cleared your mind of all the possible diversions as completely as you can when you resume practice.

I know it's not easy at first to do the Key Sound the way Jack can do it but it comes with practice. You might perhaps try practicing the KS with a pillow over your face to begin with - I've found that the slightly higher pressure that this induces in the lungs and throat on the exhale can help lower and deepen the tone and make the KS easier to pronounce.

You have felt the first signs that the KSMO can work for you - try to resume practice but in as relaxed a fashion as you can manage.