Thank you for posting your experience! I did my first flush last night, and had remarkably the same experience as your first flush. I was beginning to think that I may not have any real stones, other than the brght green ones. But having read your post, I will try again and hopefully have better results. Would you mind answering a couple of questions?
How long did you wait after your first flush before trying again?
Did you do anything different the second time that you feel helped you get better results?