your sound in the joints are most likely an adjustment reaction as long as there is no pain nothing to worry. Do not expect miracles they only happen if meant to happen anyway but keep up the good habit you will notice results on the long run.
Try to make it a habit to add the Dorn Method Self Help Exercises after the Tibetans to endure your Spine is in best shape.
You might want my book as well when it is published (maybe 4 weeks more)
Blessings
Thomas