Don't know the background of whether you have given your bowels a clesnse before starting the liver flushing, but I would recommend perhaps trying Oxypowder to clean out your tubes before flushing. I found it helps so much, leaving your systems clear to evacuate any toxins/waste quickly. You can read lots of others'
experiences with it on the forum.
Best of luck, I'm sure you'll find a solution special to yourself, it just takes some time.