I take a course of liver building/protecting herbs such as milk thistle or schizandra with burdock or dandelion to help my liver rebuild itself (by generating new liver cells) and continue cleaning. I use the gold coin grass tincture or bhumyamalaki (chanca piedra) for two weeks before the actual flush since I prefer to have smaller or softer stones if possible. Still passed some big ones though.
I did internal oleation (snehana) for a week before my third flush, which I believe helped by achieve a deeper flush (got into the gallbladder) on my third attempt.
The oleation gradually built up a stronger bile flow to help flush more out.