You are right they all soften and crunch gall stones.
In my own experience GCG was very effective, but malic acid did not work very well. Never tried the vinager.
I don´t see why you can´t combine all of them.
Remember GCG works better in empty stomach, 30 minutes before a meal.
After 18 flushes and feeling great after a bad gb attack i must say all thiese herbs+medicine work, but what really does the trick is the FLUSH.