Congratulations on a really great flush. It takes some of us months of experimenting to find exactly the right formula to make our flushes pay off. How fortunate to get such awesome results on your second flush.
I have passed some of those large stones that, when cut in half, look like a lot of stones compressed together. I've often wondered if they came out of the liver or gallbladder that way or did they somehow meld together in the intestinal tract.
Keep flushing until no more stones come out, and please keep posting. Posts like yours makes us old timers feel proud and maybe just a little bit envious for the good old days when flushing was quite an adventure.