When you said you found that not taking the morning dose was enough have you ever tried to do it?
There are times when one will not produce many stones even if they did the morning dose of ES, but it is IMPERATIVE!
I'm a colon hydrotherapist, and have done many flushes and worked with clients on their flushes, and on the occasion will have people schedule a colonic and skip the morning flush...very big mistake! Once you take the second dose of the ES the stones stuck in the liver gallbladder stimulate that bile to push any remaining stones that are by the ducts out.
I'd say try another flush. What I would do is follow the protocol to the T. Get a colonic the day of, and preferably fast or stop eating by 2pm. The week of the flush add some chanca piedra with you juice..I have found organic TART cherry juice with liver herbs to be highly effective.
Do this and see if you yield any stones...I really hope you do as I can only imagine how frustrated you are by this.